friend vs booster

friend and booster both are nouns.

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

As nouns, friend and booster are synonyms defined as:

Other synonyms of friend include admirer, champion, protagonist, supporter.

friend (noun)	booster (noun)
a person you know well and regard with affection and trust	an additional dose that makes sure the first dose was effective
a person with whom you are acquainted	the first stage of a multistage rocket
an associate who provides cooperation or assistance	an amplifier for restoring the strength of a transmitted signal
a person who backs a politician or a team etc.	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.