spurious vs invalid

spurious is not a noun while invalid is a noun.

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

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

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plausible but false	no longer valid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

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