nautilus vs nuclear submarine

nautilus and nuclear submarine both are nouns.

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

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

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

Other synonyms of nautilus include nuclear-powered submarine.

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