common ragweed

(pathology, immunology) allergy

cause (source or reason of an event or action)

(botany) pollen

grass / a weed / a herb / a scout, a spy (from the way one would hide in the grass to observe enemy troops) / (figuratively, slang, rare) pubic hair

pig; swine / (derogatory) a fat person, an unattractive woman / pork (the meat) / a wild boar

pork, pig, swine, hog

(medicine) hay fever

a fake, a mimic, not the real thing / amateur, small-time

grass / a draft, a rough copy / cursive, calligraphy in a running hand / something unofficial, an informal abbreviation or knock-off