gesture vs nod

gesture and nod both are nouns.

Word	Noun	Adjective	Verb	Adverb
gesture	Yes	No	Yes	No
nod	Yes	No	Yes	No

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

gesture: the use of movements (especially of the hands) to communicate familiar or prearranged signals
nod: a sign of assent or salutation or command

As verbs, nod is a hyponym of gesture; that is, nod is a word with a more specific, narrower meaning than gesture:

gesture (noun)	nod (noun)
motion of hands or body to emphasize or help to express a thought or feeling	the act of nodding the head
something done as an indication of intention	a sign of assent or salutation or command
the use of movements (especially of the hands) to communicate familiar or prearranged signals

gesture (verb)	nod (verb)
show, express or direct through movement	be almost asleep
	let the head fall forward through drowsiness
	lower and raise the head, as to indicate assent or agreement or confirmation
	express or signify by nodding
	sway gently back and forth, as in a nodding motion