brush aside vs reject

brush aside is not a noun while reject is a noun.

Word	Noun	Adjective	Verb	Adverb
brush aside	No	No	Yes	No
reject	Yes	No	Yes	No

As verbs, reject is a hypernym of brush aside; that is, reject is a word with a broader meaning than brush aside:

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

brush aside (verb)	reject (verb)
bar from attention or consideration	not accept something given or offered
	dismiss from consideration or a contest
	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