plugger vs barker

plugger and barker both are nouns.

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

As nouns, barker is a hyponym of plugger; that is, barker is a word with a more specific, narrower meaning than plugger:

plugger: someone who is an active supporter and advocate
barker: someone who stands in front of a show (as at a carnival) and gives a loud colorful sales talk to potential customers

plugger (noun)	barker (noun)
someone who is an active supporter and advocate	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