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

The giant rockets have an upper-stage Starship and lower-stage booster. — Brandon Lingle, San Antonio Express-News, 15 Oct. 2026

While SpaceX has successfully recovered a trio of Super Heavy boosters using the mechanical arms of its Starbase launch tower, the company has yet to return a Starship upper stage to its launch site under its own power. — Josh Dinner, Space.com, 14 Oct. 2026

Shortly after the Chinese aerospace company LandSpace launched a rocket in northwestern China, its booster—the part needed to thrust the rocket into orbit—successfully detached and landed back on earth. — Kathleen Curlee, Foreign Affairs, 14 Oct. 2026

As the first-stage booster separated from the cargo Dragon spacecraft, the light show began unfolding not only over the Space Coast, but for those who looked skyward hundreds of miles away. — Richard Tribou, The Orlando Sentinel, 13 Oct. 2026