nuclear submarine vs nautilus

nuclear submarine and nautilus both are nouns.

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

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

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

Other synonyms of nuclear submarine include nuclear-powered submarine.

nuclear 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