somewhat vs reasonably

somewhat and reasonably both are adverbs.

Word	Noun	Adjective	Verb	Adverb
somewhat	No	No	No	Yes
reasonably	No	No	No	Yes

As adverbs, somewhat and reasonably are synonyms defined as:

Other synonyms of somewhat include fairly, jolly, middling, moderately, passably, pretty.

somewhat (adverb)	reasonably (adverb)
to certain extent or degree	to certain extent or degree
to a small degree or extent	with good sense or in a reasonable or intelligent manner