belligerence (n.)

• aggression
• aggressiveness
• antagonism
• antipathy
• attack
• battle
• bellicosity
• belligerency
• bickering
• bloodshed
• chauvinism
• clash
• collision
• combat
• combativeness
• conflict
• contention
• contentiousness
• dissension
• dissent
• dissidence
• faction
• ferocity
• fierceness
• fight
• fighting
• flak
• friction
• hate
• hatred
• hostilities
• hostility
• irascibility
• irritability
• jingoism
• litigiousness
• malevolence
• malice
• malignity
• militancy
• militarism
• partisanship
• pugnacity
• quarrelsomeness
• repugnance
• shrewishness
• spite
• spitefulness
• truculence
• unfriendliness
• war
• warfare
• warmongering
• warpath
• wartime