necessarily vs inevitably

necessarily and inevitably both are adverbs.

Word	Noun	Adjective	Verb	Adverb
necessarily	No	No	No	Yes
inevitably	No	No	No	Yes

As adverbs, necessarily and inevitably are synonyms defined as:

Other synonyms of necessarily include needs, of necessity.

necessarily (adverb)	inevitably (adverb)
in an essential manner	in such a manner as could not be otherwise
as a highly likely consequence	by necessity
in such a manner as could not be otherwise