vessel vs vas

vessel and vas both are nouns.

Word	Noun	Adjective	Verb	Adverb
vessel	Yes	No	No	No
vas	Yes	No	No	No

As nouns, vessel and vas are synonyms defined as:

vessel (noun)	vas (noun)
a craft designed for water transportation	a tube in which a body fluid circulates
an object used as a container (especially for liquids)
a tube in which a body fluid circulates