Argonauts vs Argonaut

Argonauts and Argonaut both are nouns.

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

As nouns, Argonauts and Argonaut are synonyms defined as:

Argonauts and Argonaut: (Greek mythology) one of the heroes who sailed with Jason in search of the Golden Fleece

Argonauts (noun)	Argonaut (noun)
(Greek mythology) one of the heroes who sailed with Jason in search of the Golden Fleece	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