sea dog vs tar

sea dog and tar both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea dog	Yes	No	No	No
tar	Yes	No	Yes	No

As nouns, sea dog and tar are synonyms defined as:

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

sea dog (noun)	tar (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

sea dog (verb)	tar (verb)
	coat with tar