Modifiers matching antigen:

• proteinaceous,
• exogenous,
• extrinsic,
• foreign,
• oral,
• harmless,
• environmental,
• single,
• extraneous,
• strong,
• lethal,
• infectious,
• several,
• indoor,
• innocuous,
• outside,
• internal,
• active,
• dangerous,
• soluble,
• main,
• outdoor,
• possible,
• harmful,
• free,
• perennial,
• simple,
• viral,
• particulate,
• microbial,
• diverse,
• nutritional,
• endogenous,
• bacterial,
• small,
• noninfectious,
• peripheral,

Simple categories matching outdoor:

• game,
• information,
• activity,
• instrument,
• tent,
• antenna,
• possession,
• experience,
• event,
• loudspeaker,
• sport,
• wall,
• season,
• accessory,
• area,
• thing,
• clothing,
• zone,
• structure,
• waste,
• item,
• location,
• celebration,
• chair,
• plant,
• publicity,
• glove,
• crop,
• group,
• opening,
• garment,
• amusement,
• light,
• firework,
• surface,
• vehicle,
• instruction,
• lamp,
• illumination,
• package,
• leather,
• balcony,
• lot,
• part,
• enclosure,
• scene,
• duty,
• workplace,
• tank,
• sound,
• contaminant,
• cover,
• works,
• enthusiast,
• task,
• application,
• support,
• power,
• appliance,
• setting,
• pet,
• decoration,
• labor,
• worker,
• pollutant,
• space,
• wrap,
• feature,
• jacket,
• cookware,
• condition,
• theme,
• fixture,
• paving,
• program,
• graphics,
• article,
• adventure,
• court,
• elements,
• performance,
• attraction,
• occupation,
• ceremony,
• module,
• treatment,
• pastime,
• unit,
• profession,
• gathering,
• art,
• job,
• maintenance,
• planting,
• business,
• employee,
• speaker,
• substrate,
• advertising,
• attire,
• resource,
• umbrella,
• antigen,
• flower,
• apparel,
• source,
• obstacle,
• ride,
• enjoyment,
• facility,
• wood,
• contest,
• affair,
• adventurer,
• outerwear,
• protection,
• artifact,
• ornament,
• soil,
• fun,
• pursuit,
• subject,
• exhibition,
• sign,
• bath,
• allergen,
• table,
• noise,
• device,
• advertisement,
• use,
• tool,
• play,
• danger,
• atmosphere,
• festival,
• toy,
• endeavor,
• particle,
• production,
• hazard,
• color,
• gear,
• pavement,
• occurrence,
• stuff,
• chemical,
• cat,
• training,
• communication,
• entertainment,
• market,
• predator,
• display,
• function,
• service,
• covering,
• arena,
• organization,
• professional,
• furniture,
• container,
• concert,
• barrier,
• assembly,
• care,
• clothes,
• work,
• lighting,
• room,
• shelter,
• object,
• tag,
• place,
• arrangement,
• variable,
• home,
• picture,
• recreation,
• furnishing,
• property,
• obstruction,
• road,
• modification,
• bird,
• industry,
• ornamentation,
• component,
• implement,
• sportsman,
• carnival,
• impact,
• material,
• product,
• decor,
• substance,
• party,
• fabric,
• equipment,
• usage,
• animal,
• footwear,
• trade,
• education,
• site,
• drain,
• excursion,
• project,
• situation,
• building,
• machinery,
• medium,
• fire,
• amphitheater,
• skill,
• stadium,
• user,
• pest,
• ornamental,
• venue,
• person,
• critter,
• occasion,
• show,
• lover,
• shoes,
• piece,
• optics,
• system,
• seeker,
• track,
• environment,
• insect,
• shrub,
• injury,
• position,
• club,
• construction,
• installation,
• water,