like crazy vs like the devil

like crazy and like the devil both are adverbs.

Word	Noun	Adjective	Verb	Adverb
like crazy	No	No	No	Yes
like the devil	No	No	No	Yes

As adverbs, like crazy and like the devil are synonyms defined as:

like crazy and like the devil: (informal) with great speed or effort or intensity; used for emphasis

Other synonyms of like crazy include like hell, like mad, like sin, like thunder.

like crazy (adverb)	like the devil (adverb)
(informal) with great speed or effort or intensity; used for emphasis	(informal) with great speed or effort or intensity; used for emphasis