nuclear-powered submarine vs nautilus

nuclear-powered submarine and nautilus both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear-powered submarine	Yes	No	No	No
nautilus	Yes	No	No	No

As nouns, nuclear-powered submarine and nautilus are synonyms defined as:

nuclear-powered submarine and nautilus: a submarine that is propelled by nuclear power

Other synonyms of nuclear-powered submarine include nuclear submarine.

nuclear-powered submarine (noun)	nautilus (noun)
a submarine that is propelled by nuclear power	cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions
	cephalopod mollusk of warm seas whose females have delicate papery spiral shells
	a submarine that is propelled by nuclear power