nautilus vs Argonaut

nautilus and Argonaut both are nouns.

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

As nouns, nautilus and Argonaut are synonyms defined as:

nautilus and Argonaut: cephalopod mollusk of warm seas whose females have delicate papery spiral shells

Other synonyms of nautilus include Argonauta argo, paper nautilus.

nautilus (noun)	Argonaut (noun)
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
cephalopod mollusk of warm seas whose females have delicate papery spiral shells	(Greek mythology) one of the heroes who sailed with Jason in search of the Golden Fleece
a submarine that is propelled by nuclear power