arguer
disputant
disputer
eristic
polemic
polemicist
polemist
individual
mortal
person
somebody
someone
soul
accuser
contester
crusader
debater
denier
hairsplitter
logomach
logomachist
meliorist
obstructer
obstructionist
obstructor
quarreler
quarreller
reformer
reformist
resister
social reformer
thwarter
apologist
asserter
canonist
casuist
churchman
diplomatist
essayist
exegete
intriguer
jurist
lexicographer
logician
moralist
naturalist
panegyrist
parliamentarian
philanthropist
physiognomist
pleader
propagandist
publicist
reasoner
tactician