Kilkenny cats
altercation
antagonism
apologetics
apologia
apology
argument
argumentation
bicker
bickering
blood feud
brawl
broil
casuistry
cat-and-dog life
clashing
combat
conflict
confrontation
contention
contentiousness
contest
contestation
contradiction
cut and thrust
debate
defense
difference
disaccord
disaccordance
disagreement
discord
discordance
discordancy
discrepancy
discussion
disharmony
disparity
disputation
dispute
dissension
dissent
dissidence
difference of opinion
argle-bargle
argy-bargy
fight
firestorm
polemic
sparring
controversialist
controvert
controverter
controvertible
agitation
crisis
criticism
difficulty
discourse
feud
hostility
inquiry
jealousy
objection
rebellion
speculation