reject vs disapprove

reject is a noun but disapprove is not a noun.

Word	Noun	Adjective	Verb	Adverb
reject	Yes	No	Yes	No
disapprove	No	No	Yes	No

As verbs, reject and disapprove are synonyms defined as:

reject (noun)	disapprove (noun)
the person or thing that is rejected or set aside as inferior in quality

reject (verb)	disapprove (verb)
not accept something given or offered	consider bad or wrong
dismiss from consideration or a contest	deem wrong or inappropriate
deem wrong or inappropriate
reject with contempt
not accept as true
refuse entrance or membership
resist immunologically the introduction of some foreign tissue or organ