necessarily vs needs

necessarily and needs both are adverbs.

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

As adverbs, necessarily and needs are synonyms defined as:

Other synonyms of necessarily include inevitably, of necessity.

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