Simple categories matching straight:

• stock,
• object,
• weapon,
• line,
• material,
• connector,
• path,
• conductor,
• tool,
• structure,
• surface,
• activity,
• device,
• blade,
• vessel,
• bar,
• part,
• fertilizer,
• piece,
• side,
• thing,
• abrasive,
• wall,
• stick,
• road,
• tube,
• wood,
• tree,
• pin,
• seam,
• member,
• edge,
• plate,
• form,
• limb,

Members with property straight:

• beam,
• door_jam,
• vertical_line,
• screwdriver,
• straw,
• optical_axis,
• concrete,
• rail,
• pencil,
• lance,
• ruler,
• soda_straw,
• arm,
• board,
• road,
• miller_blade,
• rectangular_container,
• weight_bar,
• door_frame,
• sharp_chisel,
• femoral_vessel,
• fence_picket,
• window-blind_cord,
• square,
• pentagon,
• wall_edge,
• bar,
• text,
• rod,
• round_shovel,
• plank,
• sword,
• path,
• utility_pole,
• creek,
• thin_rod,
• arterial_road,
• birch,
• metal_rod,
• sausage_tree,
• oak,
• steel,
• house,
• club,
• vent,
• heptagon,
• construction,
• ammonium_nitrate,
• slide-projector_light,
• dipole,
• maple,
• rectangle_table,
• cherry,
• motorway,
• rhombus,
• parabola,
• shell,
• building,
• flagpole,
• building_edge,
• axis,
• border,
• yardstick,
• current_war,
• airport_lane,
• box,
• curb,
• railroad,
• polygon,
• wisconsin_blade,
• glass,
• gun,
• corner,
• insulation_plate,
• flat_chisel,
• highway,
• fence_post,
• driveway_edge,
• triangle,
• edge,
• board_mark,
• ditch,
• rectangle,
• field_boundary,
• ribbon_holder,
• phosphate,
• cube,
• freeway,
• train_track,
• diamond,
• storage_compartment,
• urea,
• king_road,
• mono_ammonium,
• panel_border,
• post,
• ball,
• horizontal_line,
• walking_stick,
• metal_straightedge,
• diagonal_line,
• plate,
• paint_stick,
• knife,
• stair,
• pillar,
• bow,
• fence,
• steel_beam,
• star_shape,
• tool_handle,
• stair_tread,
• dowel_rod,
• long_ruler,
• string_stretch,
• horizon,
• basic_line,
• asphalt,
• pine,
• roof_ridge,
• nail,
• ash,
• basilar_artery,
• bolt,
• garden_edge,
• tube_stock,
• irregular_line,
• tongue_blade,
• windows,
• high_way,
• ammonium_sulfate,
• lower_arm,
• dual_carriageway,
• mountain_path,
• row,
• poplar,
• wire,
• line,
• fluorescent_tube,
• side,
• doorway,
• nose,
• potash,
• face_plate,
• telephone-pole_start,
• ammonium_phosphate,
• craft_stick,
• branch,
• spear,
• door_threshold,
• twig,
• lower_leg,
• wall,
• asparagus,
• microtubule,
• column,
• stick,
• white_line,
• granite_bar,
• rutted_road,
• tangent,
• diamond_shape,
• aorta,
• quilting_pin,
• star,
• support_mast,
• regular_polygon,
• shaft,
• window,
• leg,
• sidewalk_crack,
• sign_post,
• hexagon,
• railway_track,
• sidewalk,
• carpenter_square,
• back_seam,
• ammonium_sulphate,
• place,