nuclear-powered submarine vs nuclear submarine

nuclear-powered submarine and nuclear submarine both are nouns.

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

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

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

Other synonyms of nuclear-powered submarine include nautilus.

nuclear-powered submarine (noun)	nuclear submarine (noun)
a submarine that is propelled by nuclear power	a submarine that is propelled by nuclear power