only vs alone

only and alone both are adjectives.

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

As adjectives, only and alone are synonyms defined as:

As adverbs, only and alone are synonyms defined as:

Other synonyms of only include entirely, exclusively, solely.

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

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