n. 25B6; noun
the peaks of the mountains : SUMMIT, top, crest, pinnacle, apex, crown, cap.
the highest peak : MOUNTAIN, hill, height, mount, alp; Scottish ben, Munro.
the peak of a cap : BRIM, visor.
the peak of his career : HEIGHT, high point/spot, pinnacle, summit, top, climax, culmination, apex, zenith, crowning point, acme, apogee, prime, heyday.
25B6; verb Labour support has peaked : REACH ITS HEIGHT, climax, reach a climax, come to a head.
25B6; adjective peak loads : MAXIMUM, top, greatest, highest; ultimate, best, optimum.