in spades vs definitely

in spades and definitely both are adverbs.

Word	Noun	Adjective	Verb	Adverb
in spades	No	No	No	Yes
definitely	No	No	No	Yes

As adverbs, in spades and definitely are synonyms defined as:

Other synonyms of in spades include by all odds, decidedly, emphatically, unquestionably.

in spades (adverb)	definitely (adverb)
without question and beyond doubt	without question and beyond doubt