poultry vs duck

poultry and duck both are nouns.

Word	Noun	Adjective	Verb	Adverb
poultry	Yes	No	No	No
duck	Yes	No	Yes	No

As nouns, duck is a hyponym of poultry; that is, duck is a word with a more specific, narrower meaning than poultry:

Other hyponyms of poultry include chicken, poulet, volaille, Rock Cornish hen, guinea hen, dove, squab, goose, turkey.

poultry (noun)	duck (noun)
a domesticated gallinaceous bird thought to be descended from the red jungle fowl	small wild or domesticated web-footed broad-billed swimming bird usually having a depressed body and short legs
flesh of chickens or turkeys or ducks or geese raised for food	a heavy cotton fabric of plain weave; used for clothing and tents
	flesh of a duck (domestic or wild)
	(cricket) a score of nothing by a batsman

poultry (verb)	duck (verb)
	avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues)
	to move (the head or body) quickly downwards or away
	submerge or plunge suddenly
	dip into a liquid