alone vs unique

alone and unique both are adjectives.

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

As adjectives, alone and unique are synonyms defined as:

Other synonyms of alone include unequaled, unequalled, unparalleled.

alone (adjective)	unique (adjective)
exclusive of anyone or anything else	radically distinctive and without equal
radically distinctive and without equal	the single one of its kind
lacking companions or companionship	(followed by `to') applying exclusively to a given category or condition or locality
isolated from others	highly unusual or rare but not the single instance

alone (adverb)	unique (adverb)
without any others being included or involved
without anybody else or anything else