alone vs only

alone and only both are adjectives.

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

As adjectives, alone and only are synonyms defined as:

As adverbs, alone and only are synonyms defined as:

Other synonyms of alone include entirely, exclusively, solely.

alone (adjective)	only (adjective)
exclusive of anyone or anything else	exclusive of anyone or anything else
radically distinctive and without equal	being the only one; single and isolated from others
lacking companions or companionship
isolated from others

alone (adverb)	only (adverb)
without any others being included or involved	with nevertheless the final result
without anybody else or anything else	without any others being included or involved
	and nothing more
	never except when
	in the final outcome
	as recently as
	except that