bird vs nib

bird and nib both are nouns.

bird (noun)	nib (noun)
warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings	the writing point of a pen
the flesh of a bird or fowl (wild or domestic) used as food	horny projecting mouth of a bird
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)	nib (verb)
watch and study birds in their natural habitat