expired vs invalid

expired is not a noun while invalid is a noun.

Word	Noun	Adjective	Verb	Adverb
expired	No	Yes	No	No
invalid	Yes	Yes	Yes	No

expired (noun)	invalid (noun)
	someone who is incapacitated by a chronic illness or injury

expired (adjective)	invalid (adjective)
having come to an end or become void after passage of a period of time	having no cogency or legal force
	no longer valid

expired (verb)	invalid (verb)
	injure permanently
	force to retire, remove from active duty, as of firemen