to battle, to fight, to wage war / to compete (in a match, for example) / to contend (for one's own interests) / (figuratively) to get through with one's sufferings or difficulties

brave, courageous

bravery, courage

frontline of a warzone / frontline of activity, the most outward area of development / (meteorology) atmospheric front

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

war (conflict involving organized use of arms)

to wage war

(meteorology) cold front