tar vs old salt

tar and old salt both are nouns.

Word	Noun	Adjective	Verb	Adverb
tar	Yes	No	Yes	No
old salt	Yes	No	No	No

As nouns, tar and old salt are synonyms defined as:

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

tar (noun)	old salt (noun)
a man who serves as a sailor	a man who serves as a sailor
any of various dark heavy viscid substances obtained as a residue

tar (verb)	old salt (verb)
coat with tar