booster vs advertiser

booster and advertiser both are nouns.

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

As nouns, advertiser is a hypernym of booster; that is, advertiser is a word with a broader meaning than booster:

Other hypernyms of booster include adman, advertizer.

booster (noun)	advertiser (noun)
an additional dose that makes sure the first dose was effective	someone whose business is advertising
the first stage of a multistage rocket
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.