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bird vs air sac air sac vs bird

bird and air sac both are nouns.

bird is a verb but air sac is not a verb.

bird (noun) air sac (noun)
warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
the flesh of a bird or fowl (wild or domestic) used as food any of the thin-walled extensions of the tracheae of insects
informal terms for a (young) woman any of the membranous air-filled extensions of the lungs of birds
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) air sac (verb)
watch and study birds in their natural habitat

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