"one who makes peace," as by reconciling parties that are at variance," early 15c., pesmaker; see peace + maker. To make peace "bring about reconciliation" is from c. 1300. Related: Peacemaking.
hostile term for a pacifist or opponent of military action, 1962, from peace + -nik. An earlier equivalent was peacemonger (1808).
also peace-time, "time when a country is not at war," 1550s, from peace + time (n.).