bird vs observe

bird is a noun but observe is not a noun.

As verbs, observe is a hypernym of bird; that is, observe is a word with a broader meaning than bird:

bird (noun)	observe (noun)
warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
the flesh of a bird or fowl (wild or domestic) used as 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)	observe (verb)
watch and study birds in their natural habitat	discover or determine the existence, presence, or fact of by perception with the eyes
	make mention of
	observe with care or pay close attention to
	watch attentively
	show respect towards
	behave as expected during of holidays or rites
	follow with the eyes or the mind
	stick to correctly or closely
	conform one's action or practice to