barker vs doggy

barker and doggy both are nouns.

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

As nouns, barker and doggy are synonyms defined as:

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

barker (noun)	doggy (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