barter vs swop

barter and swop both are nouns.

Word	Noun	Adjective	Verb	Adverb
barter	Yes	No	Yes	No
swop	Yes	No	Yes	No

As nouns, barter and swop are synonyms defined as:

Other synonyms of barter include swap, trade.

barter (noun)	swop (noun)
an equal exchange	an equal exchange

barter (verb)	swop (verb)
exchange goods without involving money	exchange or give (something) in exchange for