bribe vs grease one's palms

bribe is a noun but grease one's palms is not a noun.

Word	Noun	Adjective	Verb	Adverb
bribe	Yes	No	Yes	No
grease one's palms	No	No	Yes	No

As verbs, bribe and grease one's palms are synonyms defined as:

bribe and grease one's palms: make illegal payments to in exchange for favors or influence

Other synonyms of bribe include buy, corrupt.

bribe (noun)	grease one's palms (noun)
payment made to a person in a position of trust to corrupt his judgment

bribe (verb)	grease one's palms (verb)
make illegal payments to in exchange for favors or influence	make illegal payments to in exchange for favors or influence