postulator
Noun
Meaning
someone who assumes or takes something for granted as the basis of an argument
(Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization
Source: WordNetSynonyms
manager
asker
believer
caller
contender
fencer
requester
fixer
depositor
debater
guesser
arguer
demander
grappler
assumer
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