Synonyms of booster

booster

noun

ˈbü-stər 

as in proponent

a person who actively supports or favors a cause

rah-rah boosters for the sports team will be attending the game and carrying large signs

Synonyms & Similar Words

• proponent
• supporter
• advocate
• advocator
• exponent
• promoter
• friend
• champion
• white knight
• apostle
• protagonist
• high priest
• true believer
• paladin
• hierophant
• tub-thumper
• herald
• backer
• expounder
• stalwart
• loyalist
• espouser
• gospeler
• adherent
• cheerleader
• interpreter
• disciple
• cohort
• follower
• partisan
• encourager
• fellow traveler
• applauder

Antonyms & Near Antonyms

• opponent
• adversary
• enemy
• antagonist
• foe
• rival
• critic
• faultfinder
• belittler

Example Sentences

Recent Examples of booster

By the 1990s, as the internet was becoming a mass medium, some of its first boosters (many of whom had roots in the counterculture) were presenting it as the realization of countercultural ideals. — Jake Lundberg, The Atlantic, 3 Sep. 2026

The school had a prominent billionaire booster, Tilman Fertitta, who was financially committed to leveling the program up. — John Talty, Vanity Fair, 2 Sep. 2026

The owner of the company says all her animals have gotten a rabies booster and so have the people who work at the farm. — ABC News, 2 Sep. 2026

Returning the boosters to land allows SpaceX to recover and refurbish them to be reused on a future launch. — Eric Lagatta, USA Today, 31 Aug. 2026