Following are all the gainsayer like words, in the list below.
GAINSPEAKER
100% like gainsayer
NAYSAYER
100% like gainsayer
CONTRADICTER
100% like gainsayer
RECLAIMANT
100% like gainsayer
DISPROVER
100% like gainsayer
OPPONENT
100% like gainsayer
NAY-SAYER
100% like gainsayer
COUNTERCLAIMER
100% like gainsayer
COUNTERCLAIMANT
100% like gainsayer
IMPUGNER
100% like gainsayer
GAINSTANDER
100% like gainsayer
CONFUTER
100% like gainsayer
CONTESTER
100% like gainsayer
COUNTERPROTESTOR
100% like gainsayer
AGAINSTER
100% like gainsayer
DOUBTER
100% like gainsayer
DENIER
100% like gainsayer
CONTROVERTER
100% like gainsayer
ADVERSARY
100% like gainsayer
COUNTERWITNESS
100% like gainsayer
WITHSAYER
100% like gainsayer
WITHSTANDER
100% like gainsayer
OPPOSEE
100% like gainsayer
DISBELIEVER
100% like gainsayer
DISPRAISER
100% like gainsayer
OBJECTOR
100% like gainsayer
FORSWEARER
100% like gainsayer
OPPOSER
100% like gainsayer
OPPUGNER
100% like gainsayer
CRITIC
100% like gainsayer
SAYER
100% like gainsayer
MISBELIEVER
100% like gainsayer
FALSIFIER
100% like gainsayer
DISCREDITOR
100% like gainsayer
COUNTERPLAYER
100% like gainsayer
REPROACHER
100% like gainsayer
NEGATOR
100% like gainsayer
TESTIFIER
100% like gainsayer
ABNEGATOR
100% like gainsayer
COUNTERWAGER
100% like gainsayer
DISPUTANT
100% like gainsayer
MISCONCEIVER
100% like gainsayer
DOUBTMONGER
100% like gainsayer
COUNTERPLEADER
100% like gainsayer
DISINFORMANT
100% like gainsayer
DEROGATOR
100% like gainsayer
ANTAGONIST
100% like gainsayer
COUNTERPETITIONER
100% like gainsayer
REFUTER
100% like gainsayer
DISPUTATOR
100% like gainsayer
ANTAGONIZER
100% like gainsayer
AFFIRMANT
100% like gainsayer
PREVARICATOR
100% like gainsayer
COUNTERPLOTTER
100% like gainsayer
CONCESSOR
100% like gainsayer
CONTRAVENER
100% like gainsayer
ASSAILANT
100% like gainsayer
ACCUSEE
100% like gainsayer
SECOND GUESSER
100% like gainsayer
COUNTERBALANCER
100% like gainsayer
GRIEVANCER
100% like gainsayer
CONTRAREMONSTRANT
100% like gainsayer
DISSEMBLER
100% like gainsayer
OPPOSITE
100% like gainsayer
CONTROVERSER
100% like gainsayer
SQUABBLER
100% like gainsayer
ALTERCATOR
100% like gainsayer
TRADUCER
100% like gainsayer
DECEIVER
100% like gainsayer
ARGUFIER
100% like gainsayer
MISHEARER
100% like gainsayer
COUNTERACTER
100% like gainsayer
ACCLAIMER
100% like gainsayer
FOILER
100% like gainsayer
COUNTERRESPONDENT
100% like gainsayer
MISINFORMANT
100% like gainsayer
REPUDIATOR
100% like gainsayer
MISINFORMER
100% like gainsayer
COUNTERACTOR
100% like gainsayer
CONFABULATOR
100% like gainsayer
BELIER
100% like gainsayer
CORROBORATOR
100% like gainsayer
OUTSTANDER
100% like gainsayer
COUNTERAPPELLANT
100% like gainsayer
DENOUNCER
100% like gainsayer
DISINFORMER
100% like gainsayer
SLANDERER
100% like gainsayer
MUDSLINGER
100% like gainsayer
FALSE WITNESS
100% like gainsayer
DISAPPROVER
100% like gainsayer
DISSUADER
100% like gainsayer
BETRAYER
100% like gainsayer
GRIEVANT
100% like gainsayer
ALLEGATOR
100% like gainsayer
DISSENTIENT
100% like gainsayer
MISQUOTER
100% like gainsayer
RETORTER
100% like gainsayer
ASSERTOR
100% like gainsayer
DENIGRATOR
100% like gainsayer
GOSSIPER
100% like gainsayer