repair vs patching

repair and patching both are nouns.

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

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

repair (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
a frequently visited place
a formal way of referring to the condition of something

repair (verb)	patching (verb)
give new life or energy to
restore by replacing a part or putting together what is torn or broken
set straight or right
move, travel, or proceed toward some place
make amends for; pay compensation for