disregard vs brush off

disregard is a noun but brush off is not a noun.

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

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

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

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

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