booker vs promoter

booker and promoter both are nouns.

Word	Noun	Adjective	Verb	Adverb
booker	Yes	No	No	No
promoter	Yes	No	No	No

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

Other hyponyms of booker include impresario, showman.

booker (noun)	promoter (noun)
someone who engages a person or company for performances	someone who is an active supporter and advocate
	a sponsor who books and stages public entertainments