navigator vs sailing master

navigator and sailing master both are nouns.

Word	Noun	Adjective	Verb	Adverb
navigator	Yes	No	No	No
sailing master	Yes	No	No	No

As nouns, navigator and sailing master are synonyms defined as:

navigator and sailing master: the ship's officer in charge of navigation

navigator (noun)	sailing master (noun)
in earlier times, a person who explored by ship	the ship's officer in charge of navigation
the member of an aircrew who is responsible for the aircraft's course
the ship's officer in charge of navigation