fishing vessel vs fishing smack

fishing vessel and fishing smack both are nouns.

Word	Noun	Adjective	Verb	Adverb
fishing vessel	Yes	No	No	No
fishing smack	Yes	No	No	No

As nouns, fishing vessel and fishing smack are synonyms defined as:

fishing vessel and fishing smack: a vessel for fishing; often has a well to keep the catch alive

Other synonyms of fishing vessel include fishing boat.

fishing vessel (noun)	fishing smack (noun)
a vessel for fishing; often has a well to keep the catch alive	a vessel for fishing; often has a well to keep the catch alive