tar vs Jack

tar and Jack both are nouns.

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

As nouns, tar and Jack are synonyms defined as:

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

tar (noun)	Jack (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)	Jack (verb)
coat with tar