set afire vs set ablaze

set afire and set ablaze both are verbs.

Word	Noun	Adjective	Verb	Adverb
set afire	No	No	Yes	No
set ablaze	No	No	Yes	No

As verbs, set afire and set ablaze are synonyms defined as:

Other synonyms of set afire include set aflame, set on fire.

set afire (verb)	set ablaze (verb)
set fire to; cause to start burning	set fire to; cause to start burning