Modifiers matching allergen:

• animal,
• additional,
• airborne,
• single,
• common,
• indoor,
• strong,
• microscopic,
• environmental,
• out,
• relevant,
• unhealthy,
• respiratory,
• outdoor,
• perennial,
• important,
• cutaneous,
• active,
• size,
• systemic,
• harmful,
• natural,
• home,
• particular,
• cereal,
• individual,
• major,
• seasonal,
• possible,
• reactive,
• potential,
• unique,
• organic,
• special,
• harmless,
• outside,
• familiar,
• large,
• inhalant,
• new,
• typical,
• dietary,
• allergic,
• identifiable,
• nasty,
• rare,
• fine,
• american,

Simple categories matching perennial:

• ornamental,
• native,
• herb,
• flower,
• plant,
• fruit,
• pasture,
• vine,
• weed,
• grass,
• vegetable,
• antigen,
• tree,
• river,
• group,
• bunchgrass,
• legume,
• forage,
• planting,
• shrub,
• seed,
• wildflower,
• host,
• clover,
• pest,
• crop,
• species,
• issue,
• veggie,
• allergen,