oceanaut vs trained worker

oceanaut and trained worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
oceanaut	Yes	No	No	No
trained worker	Yes	No	No	No

As nouns, trained worker is a hypernym of oceanaut; that is, trained worker is a word with a broader meaning than oceanaut:

oceanaut: a skilled worker who can live in underwater installations and participate in scientific research
trained worker: a worker who has acquired special skills

Other hypernyms of oceanaut include skilled worker, skilled workman.

oceanaut (noun)	trained worker (noun)
a skilled worker who can live in underwater installations and participate in scientific research	a worker who has acquired special skills