bootlick vs suck up

bootlick and suck up both are verbs.

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

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

Other synonyms of bootlick include fawn, kotow, kowtow, toady, truckle.

bootlick (verb)	suck up (verb)
try to gain favor by cringing or flattering	try to gain favor by cringing or flattering
	take in, also metaphorically
	ingratiate oneself to; often with insincere behavior