crop has 15 distinct synonyms spread across 6 of its 12 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a cultivated plant that is grown commercially on a large scale
a collection of people or things appearing together
“the annual crop of students brings a new crop of ideas”
the output of something in a season
“the latest crop of fashions is about to hit the stores”
cut short
“She wanted her hair cropped short”
Synonyms, antonyms and the broader and narrower relations for crop come from Princeton University’s WordNet. Full sources and licences.