operate vs submarine

operate is not a noun while submarine is a noun.

Word	Noun	Adjective	Verb	Adverb
operate	No	No	Yes	No
submarine	Yes	Yes	Yes	No

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

Other hyponyms of operate include synchronise, synchronize, dial, turn, treadle, relay, gate, pedal, drive, aviate, fly, pilot.

operate (noun)	submarine (noun)
	a submersible warship usually armed with torpedoes
	a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States

operate (adjective)	submarine (adjective)
	beneath the surface of the sea

operate (verb)	submarine (verb)
perform surgery on	attack by submarine
perform a movement in military or naval tactics in order to secure an advantage in attack or defense	bring down with a blow to the legs
handle and cause to function	throw with an underhand motion
keep engaged	control a submarine
perform as expected when applied	move forward or under in a sliding motion
direct or control; projects, businesses, etc.