varna vs vaisya

varna and vaisya both are nouns.

Word	Noun	Adjective	Verb	Adverb
varna	Yes	No	No	No
vaisya	Yes	No	No	No

As nouns, vaisya is a hyponym of varna; that is, vaisya is a word with a more specific, narrower meaning than varna:

varna: (Hinduism) the name for the original social division of Vedic people into four groups (which are subdivided into thousands of jatis)
vaisya: the third of the four varnas: the commoners or yeoman farmers or mercantile and professional category

Other hyponyms of varna include brahman, brahmin, rajanya, shudra, sudra.

varna (noun)	vaisya (noun)
(Hinduism) the name for the original social division of Vedic people into four groups (which are subdivided into thousands of jatis)	the third of the four varnas: the commoners or yeoman farmers or mercantile and professional category