entirely vs only

entirely is not an adjective while only is an adjective.

Word	Noun	Adjective	Verb	Adverb
entirely	No	No	No	Yes
only	No	Yes	No	Yes

As adverbs, entirely and only are synonyms defined as:

Other synonyms of entirely include alone, exclusively, solely.

entirely (adjective)	only (adjective)
	exclusive of anyone or anything else
	being the only one; single and isolated from others

entirely (adverb)	only (adverb)
to a complete degree or to the full or entire extent; Completely or entirely	with nevertheless the final result
without any others being included or involved	without any others being included or involved
	and nothing more
	never except when
	in the final outcome
	as recently as
	except that