bow-wow vs barker

bow-wow and barker both are nouns.

Word	Noun	Adjective	Verb	Adverb
bow-wow	Yes	No	No	No
barker	Yes	No	No	No

As nouns, bow-wow and barker are synonyms defined as:

Other synonyms of bow-wow include doggie, doggy, pooch.

bow-wow (noun)	barker (noun)
informal terms for dogs	informal terms for dogs
the bark of a dog	someone who stands in front of a show (as at a carnival) and gives a loud colorful sales talk to potential customers