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446 synonyms for booster
immunisation
immunization
injection
dose
inoculation
shot
vaccination
vaccine
jab
fix
hit
needle
hype
prevention
administration
jag
dosage
pop
venipuncture
revaccination
dram
enema
supporter
champion
advocate
backer
promoter
exponent
proponent
apostle
protagonist
friend
expounder
advocator
herald
hierophant
upholder
gospeler
gospeller
paladin
defender
patron
enthusiast
fan
sponsor
admirer
protector
groupie
rooter
proposer
cheerleader
adherent
partisan
follower
devotee
votary
disciple
campaigner
believer
apologist
propagandist
spokesman
pupil
spokesperson
convert
cohort
sectary
fanatic
member
janissary
sympathizer
seconder
second
spokeswoman
acolyte
buff
sympathiser
crusader
votarist
stalwart
worshipper
liegeman
evangelist
benefactor
worshiper
pioneer
angel
benefactress
ally
pleader
endorser
missionary
helper
guardian
zealot
freak
subscriber
junkie
sycophant
accessory