suck up vs fawn

suck up is not a noun while fawn is a noun.

Word	Noun	Adjective	Verb	Adverb
suck up	No	No	Yes	No
fawn	Yes	No	Yes	No

As verbs, suck up and fawn are synonyms defined as:

Other synonyms of suck up include bootlick, kotow, kowtow, toady, truckle.

suck up (noun)	fawn (noun)
	a young deer
	a color or pigment varying around a light grey-brown color

suck up (verb)	fawn (verb)
try to gain favor by cringing or flattering	have fawns
take in, also metaphorically	try to gain favor by cringing or flattering
ingratiate oneself to; often with insincere behavior	show submission or fear