nod vs gesture

nod and gesture both are nouns.

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

As nouns, gesture is a hypernym of nod; that is, gesture is a word with a broader meaning than nod:

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

Other hypernyms of nod include motion.

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

Other hypernyms of nod include gesticulate, motion.

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

nod (verb)	gesture (verb)
be almost asleep	show, express or direct through movement
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