repair vs upkeep

repair and upkeep both are nouns.

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

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

repair (noun)	upkeep (noun)
the act of putting something in working order again	activity involved in maintaining something in good working order
a frequently visited place	the act of sustaining life by food or providing a means of subsistence
a formal way of referring to the condition of something

repair (verb)	upkeep (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