nod vs nutation

nod and nutation both are nouns.

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

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

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

nod (verb)	nutation (verb)
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