booster vs promoter

booster and promoter both are nouns.

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

As nouns, booster and promoter are synonyms defined as:

Other synonyms of booster include plugger.

booster (noun)	promoter (noun)
an additional dose that makes sure the first dose was effective	someone who is an active supporter and advocate
the first stage of a multistage rocket	a sponsor who books and stages public entertainments
an amplifier for restoring the strength of a transmitted signal
a thief who steals goods that are in a store
someone who is an active supporter and advocate
a person who backs a politician or a team etc.