doggy vs barker

doggy and barker both are nouns.

Word	Noun	Adjective	Verb	Adverb
doggy	Yes	No	No	No
barker	Yes	No	No	No

As nouns, doggy and barker are synonyms defined as:

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

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