picker vs fieldhand

picker and fieldhand both are nouns.

Word	Noun	Adjective	Verb	Adverb
picker	Yes	No	No	No
fieldhand	Yes	No	No	No

As nouns, fieldhand is a hypernym of picker; that is, fieldhand is a word with a broader meaning than picker:

Other hypernyms of picker include farm worker, farmhand, field hand.

picker (noun)	fieldhand (noun)
someone who gathers crops or fruits etc.	a hired hand on a farm
a person who chooses or selects out