brush aside vs disregard

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

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

As verbs, brush aside and disregard are synonyms defined as:

Other synonyms of brush aside include brush off, discount, dismiss, ignore, push aside.

brush aside (noun)	disregard (noun)
	willful lack of care and attention
	lack of attention and due care

brush aside (verb)	disregard (verb)
bar from attention or consideration	give little or no attention to
	bar from attention or consideration
	refuse to acknowledge