aflare vs on fire

aflare and on fire both are adjectives.

Word	Noun	Adjective	Verb	Adverb
aflare	No	Yes	No	No
on fire	No	Yes	No	No

As adjectives, aflare and on fire are synonyms defined as:

Other synonyms of aflare include ablaze, afire, aflame, alight.

aflare (adjective)	on fire (adjective)
lighted up by or as by fire or flame	lighted up by or as by fire or flame
streaming or flapping or spreading wide as if in a current of air