mend vs fixing

mend and fixing both are nouns.

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

As nouns, mend and fixing are synonyms defined as:

Other synonyms of mend include fix, fixture, mending, repair, reparation.

mend (noun)	fixing (noun)
the act of putting something in working order again	the act of putting something in working order again
sewing that repairs a worn or torn hole (especially in a garment)	the sterilization of an animal
	(histology) the preservation and hardening of a tissue sample to retain as nearly as possible the same relations they had in the living body
	restraint that attaches to something or holds something in place

mend (verb)	fixing (verb)
restore by replacing a part or putting together what is torn or broken
heal or recover