invalid vs incapacitate

invalid is a noun but incapacitate is not a noun.

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

As verbs, invalid and incapacitate are synonyms defined as:

Other synonyms of invalid include disable, handicap.

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

invalid (adjective)	incapacitate (adjective)
having no cogency or legal force
no longer valid

invalid (verb)	incapacitate (verb)
injure permanently	injure permanently
force to retire, remove from active duty, as of firemen	make unable to perform a certain action