entirely vs alone

entirely is not an adjective while alone is an adjective.

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

As adverbs, entirely and alone are synonyms defined as:

Other synonyms of entirely include exclusively, only, solely.

entirely (adjective)	alone (adjective)
	exclusive of anyone or anything else
	radically distinctive and without equal
	lacking companions or companionship
	isolated from others

entirely (adverb)	alone (adverb)
to a complete degree or to the full or entire extent; Completely or entirely	without any others being included or involved
without any others being included or involved	without anybody else or anything else