fixer vs darner

fixer and darner both are nouns.

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

As nouns, darner is a hyponym of fixer; that is, darner is a word with a more specific, narrower meaning than fixer:

Other hyponyms of fixer include maintenance man, repairman, service man.

fixer (noun)	darner (noun)
synthetic narcotic drug similar to morphine but less habit-forming; used in narcotic detoxification and maintenance of heroin addiction	a person who mends by darning
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)