somewhat vs more or less

somewhat and more or less both are adverbs.

Word	Noun	Adjective	Verb	Adverb
somewhat	No	No	No	Yes
more or less	No	No	No	Yes

As adverbs, somewhat and more or less are synonyms defined as:

Other synonyms of somewhat include slightly.

somewhat (adverb)	more or less (adverb)
to certain extent or degree	(of quantities) imprecise but fairly close to correct
to a small degree or extent	to a small degree or extent