fixer vs mender

fixer and mender both are nouns.

Word	Noun	Adjective	Verb	Adverb
fixer	Yes	No	No	No
mender	Yes	No	No	No

As nouns, fixer and mender are synonyms defined as:

Other synonyms of fixer include repairer.

fixer (noun)	mender (noun)
synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction	a skilled worker who mends or repairs things
someone who intervenes with authorities for a person in trouble (usually using underhand or illegal methods for a fee)
a skilled worker who mends or repairs things
a chemical compound that sets or fixes something (as a dye or a photographic image)