invalid vs spurious

invalid is a noun but spurious is not a noun.

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

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

invalid (adjective)	spurious (adjective)
having no cogency or legal force	false or fake; not what it appears to be
no longer valid	plausible but false
	born out of wedlock
	ostensibly valid, but not actually valid

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