nod vs gesticulate

nod is a noun but gesticulate is not a noun.

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

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

Other hypernyms of nod include gesture, motion.

nod (noun)	gesticulate (noun)
the act of nodding the head
a sign of assent or salutation or command

nod (verb)	gesticulate (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