owner vs shipowner

owner and shipowner both are nouns.

Word	Noun	Adjective	Verb	Adverb
owner	Yes	No	No	No
shipowner	Yes	No	No	No

As nouns, shipowner is a hyponym of owner; that is, shipowner is a word with a more specific, narrower meaning than owner:

Other hyponyms of owner include holder, homeowner, householder, part-owner, saver.

owner (noun)	shipowner (noun)
(law) someone who owns (is legal possessor of) a business	someone who owns a ship or a share in a ship
a person who owns something