bow down vs gesture

bow down is not a noun while gesture is a noun.

Word	Noun	Adjective	Verb	Adverb
bow down	No	No	Yes	No
gesture	Yes	No	Yes	No

As verbs, gesture is a hypernym of bow down; that is, gesture is a word with a broader meaning than bow down:

Other hypernyms of bow down include gesticulate, motion.

bow down (noun)	gesture (noun)
	motion of hands or body to emphasize or help to express a thought or feeling
	something done as an indication of intention
	the use of movements (especially of the hands) to communicate familiar or prearranged signals

bow down (verb)	gesture (verb)
bend one's knee or body, or lower one's head	show, express or direct through movement
get into a prostrate position, as in submission