mariner vs Jack-tar

mariner and Jack-tar both are nouns.

Word	Noun	Adjective	Verb	Adverb
mariner	Yes	No	No	No
Jack-tar	Yes	No	No	No

As nouns, mariner and Jack-tar are synonyms defined as:

Other synonyms of mariner include gob, Jack, old salt, sea dog, seafarer, seaman, tar.

mariner (noun)	Jack-tar (noun)
a man who serves as a sailor	a man who serves as a sailor