Nouns

(n)militant, activista militant reformer

Adjectives

(s)militant, hawkish, warlikedisposed to warfare or hard-line policies“militant nations”, “hawkish congressman”, “warlike policies”
(s)competitive, militantshowing a fighting disposition“highly competitive sales representative”, “militant in fighting for better wages for workers”
(s)belligerent, militant, war-ridden, warringengaged in war“belligerent (or warring) nations”