oceanaut vs aquanaut

oceanaut and aquanaut both are nouns.

Word	Noun	Adjective	Verb	Adverb
oceanaut	Yes	No	No	No
aquanaut	Yes	No	No	No

As nouns, oceanaut and aquanaut are synonyms defined as:

oceanaut and aquanaut: a skilled worker who can live in underwater installations and participate in scientific research

oceanaut (noun)	aquanaut (noun)
a skilled worker who can live in underwater installations and participate in scientific research	an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder
	a skilled worker who can live in underwater installations and participate in scientific research