investment vs subscribe

investment is a noun but subscribe is not a noun.

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

investment (noun)	subscribe (noun)
the act of investing; laying out money or capital in an enterprise with the expectation of profit
the act of putting on robes or vestments
the ceremonial act of clothing someone in the insignia of an office; the formal promotion of a person to an office or rank
outer layer or covering of an organ or part or organism
the commitment of something other than money (time, energy, or effort) to a project with the expectation of some worthwhile result
money that is invested with an expectation of profit

investment (verb)	subscribe (verb)
	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