仇 (chóu) is a literary noun that can mean either 'hatred, enmity' (abstract) or 'foe, enemy' (a person). As 'hatred', it is more formal and often appears in fixed expressions (e.g., 报仇 'revenge') compared to the common noun 仇恨 (chóu hèn). As 'enemy', it refers to a personal adversary (often in compounds like 仇人) and is less general than 敌人 (dí rén, military/political enemy).