inevitably vs of necessity

inevitably and of necessity both are adverbs.

Word	Noun	Adjective	Verb	Adverb
inevitably	No	No	No	Yes
of necessity	No	No	No	Yes

As adverbs, inevitably and of necessity are synonyms defined as:

Other synonyms of inevitably include necessarily, needs.

inevitably (adverb)	of necessity (adverb)
in such a manner as could not be otherwise	in such a manner as could not be otherwise
by necessity