dismiss vs disregard

dismiss is not a noun while disregard is a noun.

Word	Noun	Adjective	Verb	Adverb
dismiss	No	No	Yes	No
disregard	Yes	No	Yes	No

As verbs, dismiss and disregard are synonyms defined as:

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

dismiss (noun)	disregard (noun)
	willful lack of care and attention
	lack of attention and due care

dismiss (verb)	disregard (verb)
declare void	give little or no attention to
bar from attention or consideration	bar from attention or consideration
end one's encounter with somebody by causing or permitting the person to leave	refuse to acknowledge
cease to consider; put out of judicial consideration
terminate the employment of; discharge from an office or position
stop associating with