vas vs vessel

vas and vessel both are nouns.

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

As nouns, vas and vessel are synonyms defined as:

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