okay vs subscribe

okay is a noun but subscribe is not a noun.

Word	Noun	Adjective	Verb	Adverb
okay	Yes	Yes	Yes	Yes
subscribe	No	No	Yes	No

okay (noun)	subscribe (noun)
an endorsement

okay (adjective)	subscribe (adjective)
being satisfactory or in satisfactory condition

okay (verb)	subscribe (verb)
give sanction to	mark with one's signature; write one's name (on)
	adopt as a belief
	receive or obtain regularly
	offer to buy, as of stocks and shares
	pay (an amount of money) as a contribution to a charity or service, especially at regular intervals

okay (adverb)	subscribe (adverb)
in a satisfactory or adequate manner