Modifiers matching retrovirus:

• complex,
• exogenous,
• important,
• smaller,
• epidemic,
• latent,
• pathogenic,
• persistent,

Simple categories matching smaller:

• watercraft,
• animal,
• mammal,
• dog,
• manual,
• original,
• utility,
• garden,
• tire,
• item,
• space,
• prey,
• bird,
• manufacturer,
• stone,
• trinket,
• sector,
• change,
• nightshade,
• works,
• shelter,
• incident,
• fish,
• predator,
• carnivore,
• organisation,
• pet,
• marking,
• rock,
• creature,
• market,
• arms,
• artery,
• offence,
• antenna,
• parasite,
• hound,
• newspaper,
• microorganism,
• bulb,
• residence,
• coin,
• organism,
• basket,
• duck,
• guitar,
• poster,
• installation,
• requirement,
• vessel,
• dish,
• woodpecker,
• loan,
• compartment,
• fighter,
• joint,
• molecule,
• obstruction,
• shellfish,
• sign,
• insectivore,
• embryo,
• ball,
• group,
• detachment,
• artiodactyl,
• supermarket,
• display,
• jurisdiction,
• state,
• mechanism,
• thing,
• artefact,
• database,
• extremity,
• funds,
• implement,
• denomination,
• municipality,
• germ,
• commodity,
• gathering,
• period,
• concept,
• intermediate,
• environment,
• debt,
• array,
• van,
• activity,
• function,
• line,
• task,
• arthropod,
• microbe,
• golf-club,
• fauna,
• cpu,
• disaster,
• seabird,
• belongings,
• producer,
• ensemble,
• benefit,
• limb,
• utensil,
• halide,
• formation,
• domain,
• racket,
• island,
• vertebrate,
• crime,
• library,
• friend,
• bait,
• leak,
• collection,
• shrub,
• aircraft,
• fruit,
• way,
• quarters,
• object,
• bakery,
• fly,
• meal,
• waterway,
• touch,
• potato,
• arrangement,
• particle,
• impurity,
• device,
• show,
• retrovirus,
• structure,
• world,
• eyes,
• wheel,
• amount,
• food,
• saccharide,
• tyre,
• theater,
• abrasive,
• sample,
• image,
• accessory,
• catheter,
• magazine,
• job,
• bandwidth,
• passerine,
• insect,
• marsupial,
• process,
• artifact,
• grass,
• conference,
• swimwear,
• outlet,
• being,
• province,
• radical,
• horse,
• settlement,
• critter,
• section,
• expense,
• cause,
• devices,
• event,
• ingredient,
• grain,
• ruminant,
• furnishing,
• vehicle,
• language,
• deer,
• society,
• fraction,
• building,
• hawk,
• gesture,
• tribe,
• coil,
• level,
• player,
• copier,
• sugar,
• solute,
• enterprise,
• document,
• catalog,
• residue,
• airline,
• contaminant,
• population,
• text,
• piece,
• creditor,
• planet,
• procedure,
• wallaby,
• light,
• alkyl,
• industry,
• biped,
• division,
• retailer,
• drug,
• organization,
• vendor,
• pathogen,
• territory,
• congregation,
• fastener,
• constituent,
• glasses,
• bivalve,
• committee,
• herbivore,
• gourd,
• perennial,
• watch,
• fire,
• holding,
• pest,
• ship,
• party,
• country,
• snake,
• brush,
• race,
• shorebird,
• carrier,
• gadget,
• catastrophe,
• parakeet,
• complex,
• customer,
• fixture,
• particulate,
• essay,
• appendage,
• marker,
• network,
• book,
• owl,
• pollinator,
• force,
• subject,
• scale,
• conifer,
• center,
• curio,
• store,
• combination,
• plane,
• ungulate,
• user,
• gear,
• cat,
• cake,
• practice,
• species,
• transformer,
• facility,
• antelope,
• importer,
• aeroplane,
• difference,
• enclosure,
• details,
• representation,
• mollusk,
• wrasse,
• inhabitant,
• company,
• values,
• plan,
• purchase,
• material,
• garment,
• order,
• centre,
• operation,
• people,
• crater,
• songbird,
• course,
• service,
• hide,
• epiphyte,
• mall,
• atom,
• fare,
• aggregate,
• fuel,
• fragment,
• dining-room,
• tree,
• peer,
• outbuilding,
• solid,
• band,
• os,
• lizard,
• finch,
• beast,
• institution,
• aggregation,
• analyzer,
• leaf,
• container,
• peripheral,
• furniture,
• antiquity,
• chapel,
• post,
• oilseed,
• transport,
• venue,
• compound,
• firework,
• bag,
• village,
• pool,
• battery,
• bay,
• server,
• plate,
• community,
• protist,
• game,
• construction,
• fiber,
• shop,
• surface,
• dwelling,
• livestock,
• toy,
• package,
• craft,
• gun,
• raptor,
• projectile,
• restaurant,
• publication,
• establishment,
• size,
• paraphernalia,
• medium,
• design,
• club,
• project,
• subdivision,
• dimension,
• league,
• macromolecule,
• interval,
• tent,
• set,
• cetacean,
• component,
• measure,
• seed,
• city,
• format,
• invertebrate,
• region,
• bow,
• boutique,
• muscle,
• filter,
• petrel,
• deposit,
• lake,
• action,
• monkey,
• bug,
• kernel,
• grouping,
• ruin,
• sink,
• metal,
• crustacean,
• mustelid,
• fan,
• block,
• truck,
• bean,
• assets,
• bottle,
• mass,
• feature,
• file,
• neighbourhood,
• rocket,
• cactus,
• ornament,
• surgery,
• weapon,
• sport,
• passage,
• rv,
• assembly,
• rodent,
• appliance,
• shape,
• meeting,
• article,
• indicator,
• limo,
• picture,
• office,
• ventilator,
• programme,
• volume,
• loach,
• load,
• salmon,
• sphere,
• treasure,
• wave,
• proposal,
• sacrifice,
• lapdog,
• clothes,
• administration,
• beads,
• place,
• whale,
• quarry,
• rod,
• linen,
• ion,
• quantity,
• spring,
• location,
• work,
• stuff,
• cable,
• difficulty,
• pond,
• drain,
• substrate,
• entity,
• product,
• automobile,
• pulse,
• distributor,
• program,
• independent,
• flower,
• canine,
• town,
• tissue,
• box,
• street,
• reward,
• housing,
• screen,
• cell,
• berry,
• textile,
• pig,
• pollutant,
• meat,
• tool,
• plant,
• apparel,
• lure,
• sunfish,
• reptile,
• studio,
• engine,
• tuna,
• halibut,
• windows,
• connection,
• car,
• person,
• eukaryote,
• theatre,
• eatery,
• manuscript,
• cardinal,
• pan,
• spider,
• technology,
• production,
• equipment,
• watershed,
• system,
• application,
• firm,
• waterfowl,
• gang,
• nature,
• machine,
• trade,
• bike,
• stream,
• site,
• hotel,
• figure,
• door,
• virus,
• basin,
• operations,
• sensor,
• wedding,
• host,
• use,
• college,
• source,
• zone,
• shark,
• computer,
• museum,
• instrument,
• memorial,
• school,
• family,
• boat,
• vial,
• nut,
• area,
• scooter,
• foliage,
• arena,
• opening,
• gastropod,
• nation,
• business,
• vein,
• body,
• warship,
• payment,
• value,
• rarity,
• bush,
• part,
• lodging,
• subgroup,
• pipe,
• blockage,
• boundary,
• parrot,
• substance,
• household,
• segment,
• pot,
• felid,
• cyprinid,
• vegetable,
• tract,
• portion,
• effort,
• wire,
• hazard,
• heel,
• graphics,
• receptacle,
• home,
• tank,
• jar,
• roll,
• happening,
• relative,
• room,
• canid,
• movement,
• protein,
• unit,
• property,
• falcon,
• creek,
• blossom,
• ngo,
• precursor,
• district,
• centrarchid,
• zooplankton,
• map,
• agency,
• watercourse,