repair vs meliorate

repair is a noun but meliorate is not a noun.

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

As verbs, meliorate is a hypernym of repair; that is, meliorate is a word with a broader meaning than repair:

repair: restore by replacing a part or putting together what is torn or broken
meliorate: to make better

Other hypernyms of repair include ameliorate, amend, better, improve.

repair (noun)	meliorate (noun)
the act of putting something in working order again
a frequently visited place
a formal way of referring to the condition of something

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