reasonably vs somewhat

reasonably and somewhat both are adverbs.

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

As adverbs, reasonably and somewhat are synonyms defined as:

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

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