nautilus vs chambered nautilus

nautilus and chambered nautilus both are nouns.

Word	Noun	Adjective	Verb	Adverb
nautilus	Yes	No	No	No
chambered nautilus	Yes	No	No	No

As nouns, nautilus and chambered nautilus are synonyms defined as:

nautilus and chambered nautilus: cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions

Other synonyms of nautilus include pearly nautilus.

nautilus (noun)	chambered nautilus (noun)
cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions	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