subscribe vs okay

subscribe is not a noun while okay is a noun.

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

subscribe (noun)	okay (noun)
	an endorsement

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

subscribe (verb)	okay (verb)
mark with one's signature; write one's name (on)	give sanction to
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

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