fixture vs patching

fixture and patching both are nouns.

Word	Noun	Adjective	Verb	Adverb
fixture	Yes	No	No	No
patching	Yes	No	No	No

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

fixture (noun)	patching (noun)
the act of putting something in working order again	the act of mending a hole in a garment by sewing a patch over it
an object firmly fixed in place (especially in a household)
the quality of being fixed in place as by some firm attachment
a regular patron