buttock vs cheek

buttock and cheek both are nouns.

Word	Noun	Adjective	Verb	Adverb
buttock	Yes	No	No	No
cheek	Yes	No	Yes	No

As nouns, buttock and cheek are synonyms defined as:

buttock and cheek: either of the two large fleshy masses of muscular tissue that form the human rump

buttock (noun)	cheek (noun)
either of the two large fleshy masses of muscular tissue that form the human rump	impudent aggressiveness
	either side of the face below the eyes
	either of the two large fleshy masses of muscular tissue that form the human rump
	an impudent statement

buttock (verb)	cheek (verb)
	speak impudently to