grease one's palms vs buy

grease one's palms is not a noun while buy is a noun.

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

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

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

Other synonyms of grease one's palms include bribe, corrupt.

grease one's palms (noun)	buy (noun)
	an advantageous purchase

grease one's palms (verb)	buy (verb)
make illegal payments to in exchange for favors or influence	accept as true
	obtain by purchase; acquire by means of a financial transaction
	make illegal payments to in exchange for favors or influence
	acquire by trade or sacrifice or exchange
	be worth or be capable of buying