heal vs mend

heal is not a noun while mend is a noun.

Word	Noun	Adjective	Verb	Adverb
heal	No	No	Yes	No
mend	Yes	No	Yes	No

As verbs, heal and mend are synonyms defined as:

heal (noun)	mend (noun)
	the act of putting something in working order again
	sewing that repairs a worn or torn hole (especially in a garment)

heal (verb)	mend (verb)
get healthy again	restore by replacing a part or putting together what is torn or broken
provide a cure for, make healthy again	heal or recover
heal or recover