crawler vs ass-kisser

crawler and ass-kisser both are nouns.

Word	Noun	Adjective	Verb	Adverb
crawler	Yes	No	No	No
ass-kisser	Yes	No	No	No

As nouns, crawler and ass-kisser are synonyms defined as:

crawler and ass-kisser: a person who tries to please someone in order to gain a personal advantage

Other synonyms of crawler include lackey, sycophant, toady.

crawler (noun)	ass-kisser (noun)
terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers	a person who tries to please someone in order to gain a personal advantage
a person who tries to please someone in order to gain a personal advantage
a person who crawls or creeps along the ground