Argonaut vs Argonauts

Argonaut and Argonauts both are nouns.

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

As nouns, Argonaut and Argonauts are synonyms defined as:

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

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