bird vs poultry

bird and poultry both are nouns.

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

Other hyponyms of bird include wildfowl.

bird (noun)	poultry (noun)
warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings	a domesticated gallinaceous bird thought to be descended from the red jungle fowl
the flesh of a bird or fowl (wild or domestic) used as food	flesh of chickens or turkeys or ducks or geese raised for food
informal terms for a (young) woman
a cry or noise made to express displeasure or contempt
badminton equipment consisting of a ball of cork or rubber with a crown of feathers

bird (verb)	poultry (verb)
watch and study birds in their natural habitat