Following are all the flabbergast like words, in the list below.
BOGGLE
100% like flabbergast
BOWL OVER
99.92% like flabbergast
AMAZE
66.72% like flabbergast
STUN
66.72% like flabbergast
FLABBERGASTER
33.44% like flabbergast
FLABBERGHAST
33.44% like flabbergast
FLABAGHAST
33.44% like flabbergast
FLABAGAST
33.44% like flabbergast
FLAPPERGAST
33.44% like flabbergast
FLUMMOX
33.44% like flabbergast
BLOW AWAY
33.44% like flabbergast
DUMBFOUND
33.44% like flabbergast
ASTOUND
33.44% like flabbergast
KERFLUMMOX
33.44% like flabbergast
TAKE ABACK
33.44% like flabbergast
BAFFOUND
33.44% like flabbergast
CONFOUND
33.44% like flabbergast
BEFUDDLE
33.44% like flabbergast
BEWILDER
33.44% like flabbergast
DISCOMBOBULATE
33.44% like flabbergast
BAFFLE
33.44% like flabbergast
PERPLEX
33.44% like flabbergast
BEGHAST
33.44% like flabbergast
EMBARRASS
33.44% like flabbergast
SURPRISE
33.44% like flabbergast
BEWITCH
33.44% like flabbergast
MYSTIFY
33.44% like flabbergast
FLUSTERATE
33.44% like flabbergast
BEFRIGHT
33.44% like flabbergast
SET ABACK
33.44% like flabbergast
FLUSTER
33.44% like flabbergast
FREAK OUT
33.44% like flabbergast
ASTONISH
33.44% like flabbergast
TRANSFIX
33.44% like flabbergast
UNBEWILDER
33.44% like flabbergast
STARTLE
33.44% like flabbergast
BEDAZZLE
33.44% like flabbergast
BAMBOOZLE
33.44% like flabbergast
UNBAFFLE
33.44% like flabbergast
CONFUZZLE
33.44% like flabbergast
BEFLUTTER
33.44% like flabbergast
EFFASCINATE
33.44% like flabbergast
CONFUSE
33.44% like flabbergast
KNOCK FOR A LOOP
33.44% like flabbergast
DISCONCERT
33.44% like flabbergast
MARVEL
33.44% like flabbergast
STUPEFY
33.44% like flabbergast
FLOOR
33.44% like flabbergast
FLURRY
33.44% like flabbergast
FLUSTRATE
33.44% like flabbergast
STAGGER
33.44% like flabbergast
DIZZY
33.44% like flabbergast
BUMFUZZLE
33.44% like flabbergast
DAZZLE
33.44% like flabbergast
BEGLAMMER
33.44% like flabbergast
DISCOMFIT
33.44% like flabbergast
BEMAZE
33.44% like flabbergast
CONFUDDLE
33.44% like flabbergast
CONFUSCATE
33.44% like flabbergast
SCARE THE BEJEEBERS OUT OF
33.44% like flabbergast
BEDAFF
33.44% like flabbergast
JIMJAM
33.44% like flabbergast
BAZE
33.44% like flabbergast
OVERDAZZLE
33.44% like flabbergast
BEDEVIL
33.44% like flabbergast
RAZZLE-DAZZLE
33.44% like flabbergast
SHOCK
33.44% like flabbergast
DEBAMBOOZLE
33.44% like flabbergast
DUMBFOUNDER
33.44% like flabbergast
FREAK
33.44% like flabbergast
CONFUSTICATE
33.44% like flabbergast
FORWONDER
33.44% like flabbergast
WONDER
33.44% like flabbergast
STUMPIFY
33.44% like flabbergast
DIZZIFY
33.44% like flabbergast
BEGLAMOUR
33.44% like flabbergast
NONPLUS
33.44% like flabbergast
CONTURB
33.44% like flabbergast
SPOOK
33.44% like flabbergast
FRIGHTEN
33.44% like flabbergast
EXHILARATE
33.44% like flabbergast
FUDDLE
33.44% like flabbergast
DISMAY
33.44% like flabbergast
OBSTUPEFY
33.44% like flabbergast
BECHARM
33.44% like flabbergast
TERRIFY
33.44% like flabbergast
FLUTTER
33.44% like flabbergast
INFATUATE
33.44% like flabbergast
ABASH
33.44% like flabbergast
OVERFRIGHTEN
33.44% like flabbergast
APPALL
33.44% like flabbergast
CONSTERNATE
33.44% like flabbergast
BOMBASE
33.44% like flabbergast
UPSTARTLE
33.44% like flabbergast
CONVULSE
33.44% like flabbergast
SCANDALIZE
33.44% like flabbergast
ENRAGE
33.44% like flabbergast
OVERWHELM
33.44% like flabbergast
BEGUILE
33.44% like flabbergast
BEJUMBLE
33.44% like flabbergast