involve vs cost

involve is not a noun while cost is a noun.

Word	Noun	Adjective	Verb	Adverb
involve	No	No	Yes	No
cost	Yes	No	Yes	No

As verbs, cost is a hyponym of involve; that is, cost is a word with a more specific, narrower meaning than involve:

Other hyponyms of involve include claim, exact, take, govern, draw, cry for, cry out for, compel.

involve (noun)	cost (noun)
	the property of having material worth (often indicated by the amount of money something would bring if sold)
	value measured by what must be given or done or undergone to obtain something
	the total spent for goods or services including money and time and labor

involve (verb)	cost (verb)
make complex or intricate or complicated	be priced at
occupy or engage the interest of	require to lose, suffer, or sacrifice
have as a necessary feature
connect closely and often incriminatingly
contain as a part
engage as a participant
require as useful, just, or proper