Modifiers matching oxygen:

• elemental,
• active,
• molecular,
• dissolved,
• atomic,
• abundant,
• bound,
• pure,
• free,

Simple categories matching active:

• cell,
• substance,
• metal,
• job,
• recreation,
• code,
• compound,
• motion,
• relay,
• insect,
• invertebrate,
• gadget,
• material,
• sport,
• agonist,
• attraction,
• enzyme,
• molecule,
• order,
• medicine,
• disease,
• galaxy,
• activity,
• line,
• module,
• component,
• therapy,
• organ,
• atmosphere,
• song,
• information,
• polymer,
• tissue,
• prey,
• iud,
• task,
• touch,
• neurohormone,
• employment,
• defense,
• user,
• property,
• athlete,
• sentiment,
• party,
• carotenoid,
• protein,
• star,
• elements,
• fun,
• moiety,
• trap,
• space,
• residue,
• muscle,
• coolant,
• solid,
• fertilizer,
• pathology,
• predator,
• response,
• exercise,
• body,
• ingredient,
• packing,
• br,
• phosphatase,
• display,
• micronutrient,
• corticosteroid,
• solvent,
• interaction,
• alloy,
• macromolecule,
• support,
• soil,
• profession,
• emotion,
• modality,
• creature,
• sensor,
• mineral,
• peptide,
• content,
• amusement,
• microorganism,
• domain,
• widget,
• play,
• growth,
• passion,
• livestock,
• item,
• procedure,
• yeast,
• person,
• load,
• scavenger,
• foundation,
• environment,
• switch,
• issue,
• antigen,
• toy,
• firewall,
• event,
• backpacker,
• works,
• anode,
• science,
• medium,
• engagement,
• mechanism,
• subject,
• hormone,
• worm,
• part,
• carbon,
• alkaloid,
• protease,
• herb,
• antimetabolite,
• competition,
• ir,
• relative,
• state,
• pursuit,
• thing,
• business,
• process,
• receptor,
• institution,
• instrument,
• protocol,
• problem,
• fauna,
• repeater,
• gas,
• monomer,
• hydrocolloid,
• ministry,
• limb,
• structure,
• owner,
• radical,
• portion,
• rift,
• carbonate,
• outing,
• alkali,
• change,
• region,
• people,
• benzodiazepine,
• pesticide,
• buffer,
• form,
• vehicle,
• chlorine,
• usage,
• effort,
• movement,
• cytokine,
• contamination,
• interface,
• clay,
• operations,
• devices,
• service,
• waste,
• tumor,
• metabolite,
• game,
• file,
• directory,
• species,
• union,
• nucleotide,
• date,
• oxide,
• factor,
• operation,
• sensation,
• alarm,
• particle,
• instrumentation,
• experience,
• behavior,
• glucocorticoid,
• acid,
• formation,
• progestin,
• practice,
• animal,
• product,
• alcohol,
• snake,
• intermediate,
• estrogen,
• database,
• waterway,
• antidepressant,
• amine,
• function,
• mixer,
• ability,
• class,
• shoes,
• detector,
• chemical,
• phenomenon,
• disorder,
• adulterant,
• matter,
• object,
• virus,
• entity,
• zone,
• room,
• anticoagulant,
• fraction,
• atom,
• isomer,
• membrane,
• layer,
• pet,
• block,
• preparation,
• group,
• agent,
• action,
• system,
• medication,
• steroid,
• drug,
• female,
• facility,
• carnivore,
• analgesic,
• holiday,
• development,
• option,
• entertainment,
• area,
• organs,
• control,
• education,
• corticoid,
• industry,
• elimination,
• mammal,
• society,
• hydrogen,
• volatile,
• work,
• depressant,
• symptom,
• stimulation,
• illness,
• neuroleptic,
• carrier,
• cation,
• participation,
• individual,
• filler,
• repository,
• element,
• endeavour,
• street,
• condition,
• polypeptide,
• infection,
• oxygen,
• lipid,
• plant,
• anesthetic,
• array,
• polysaccharide,
• situation,
• source,
• allergen,
• defence,
• safety,
• pigment,
• discipline,
• cancer,
• falcon,
• market,
• surface,
• teleost,
• organism,
• solute,
• androgen,
• radar,
• radiator,
• hardware,
• crime,
• device,
• lesion,
• phytochemical,
• catalyst,
• phagocyte,
• fish,
• restoration,
• rest,
• ester,
• force,
• organization,
• sedative,
• halogen,
• income,
• equipment,
• antibiotic,
• behaviour,
• male,
• substrate,
• intervention,
• indication,
• card,
• aldehyde,
• treatment,
• document,
• tuberculosis,
• place,
• salt,
• bacteria,
• connection,
• fabric,
• precursor,
• endeavor,
• subsystem,
• country,
• stimulant,
• occupation,
• graphics,
• command,
• ketone,
• basin,
• impurity,
• decay,
• lysozyme,
• use,
• feature,
• constituent,
• nekton,
• filter,
• unit,
• ligand,
• contaminant,
• measure,
• ectotherm,
• food,
• arts,
• arthritis,
• quality,
• means,
• proteinase,
• dog,