bark vs barker

bark and barker both are nouns.

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

bark (noun)	barker (noun)
a sailing ship with 3 (or more) masts	informal terms for dogs
the sound made by a dog	someone who stands in front of a show (as at a carnival) and gives a loud colorful sales talk to potential customers
a noise resembling the bark of a dog
tough protective covering of the woody stems and roots of trees and other woody plants