necessarily vs needfully

necessarily and needfully both are adverbs.

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

As adverbs, necessarily and needfully are synonyms defined as:

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