seller vs vendor

seller and vendor both are nouns.

Word	Noun	Adjective	Verb	Adverb
seller	Yes	No	No	No
vendor	Yes	No	No	No

As nouns, seller and vendor are synonyms defined as:

seller and vendor: someone who promotes or exchanges goods or services for money

Other synonyms of seller include marketer, trafficker, vender.

seller (noun)	vendor (noun)
someone who promotes or exchanges goods or services for money	someone who promotes or exchanges goods or services for money