like mad vs like the devil

like mad and like the devil both are adverbs.

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

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

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

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

like mad (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