chambered nautilus vs nautilus

chambered nautilus and nautilus both are nouns.

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

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

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

Other synonyms of chambered nautilus include pearly nautilus.

chambered nautilus (noun)	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