Synonyms for Peak:

adj.

summit (adjective)
acme, apex, crowning, extreme, highest, maximum, pinnacle, summit, tip, top, topmost, uppermost, zenith, Capping, Headmost, Culminating, loftiest.

n.

above, aloft, elevated, over, upper, high up. add to, brim, convex, double, escalate, go up, increase, multiply, protection, raise, soar, step up, go through the roof. achieve, apogee, flourish, get ahead, payoff, prosper, succeed, thrive, fastigium, win out, be a roaring success, be/get there. bustling, buzz, culminate, excite, frenzy, hectic, hum, lively, madhouse, busy season, Grand Central Station. less, let, minus, plus, power, And, IFF, divide/multiply by. breakthrough, comeback, golden age, glory days, someone's day in the sun. breaking point, crossroads, highlight, milestone, turning point, watershed, the moment of truth, the point of no return. ascent, bluff, cliff, dune, fell, foothills, highlands, Butte, Downs. brink, cairn, crag, divide, escarpment, Brae, the brow. cockade, hatpin, plume, chinstrap. chevron, cross, cube, cuboid, diamond, equilateral triangle, flare, fractal, heptagon, hexagon. extreme (noun)
extreme.
height (noun)
height.
maximum, zenith (noun)
acme, apogee, climax, culmination, height, top.
mountain (noun)
alp, hill, hump, mount, mountain, range, sierra.
peak (noun)
acme, apex, bill, bloom, blossom, climactic, climactical, crest, crown, efflorescence, elevation, extremum, eyeshade, flower, flush, height, heyday, high, highest, maximal, maximum, peak-seaason, pinnacle, point, prime, reach a peak, summit, superlative, tip, top, vertex, visor, vizor, high season.
quantity (noun)
extremum.
summit (noun)
brow, cap, climax, crest, crown, culmination, extremity, limit, highest point, topmost point, uppermost point.
top (noun)
elite, roof.
top of something (noun)
alp, apex, brow, crest, crown, hill, mount, mountain, pinnacle, point, roof, summit, tip, vertex.

v.

reach highest point (verb)
culminate.

Other synonyms:

apogee, breaking point, breakthrough, brink, bustling, cockade, comeback, crossroads, frenzy, golden age, hatpin, hectic, less, madhouse, milestone, payoff, plume, turning point, IFF, chinstrap, fastigium, busy season, glory days, Grand Central Station. brim, buzz, culminate, hum, let, lively, watershed, And. minus. highlight. power. plus. bluff
crag.
high-season
high season.
Other relevant words:
achieve, apogee, bill, bloom, blossom, bluff, brim, brink, cliff, climactic, climactical, cockade, crag, culminate, dune, efflorescence, elevated, elevation, escarpment, extremum, eyeshade, fell, flourish, flower, flush, hatpin, height, heyday, high, highlands, highlight, hum, let, maximal, minus, payoff, peak-seaason, plus, point, prime, prosper, superlative, thrive, turning point, vertex, visor, vizor, And, Brae, Butte, IFF, chinstrap, fastigium.

Usage examples for peak

  1. The principal mountains in Ceylon are Pedrotallagalla, eight thousand two hundred and eighty feet; Kirigallapotta, seven thousand nine hundred; Totapella, eight thousand feet; and Adam's Peak seven thousand seven hundred; but although their altitude is so considerable, they do not give the idea of grandeur which such an altitude would convey. – Eight Years' Wandering in Ceylon by Samuel White Baker
  2. From under the peak of his cap each man could now see scarcely a yard before him. – The Heart of Canyon Pass by Thomas K. Holmes
  3. At the southern end of the island rose an abrupt black peak – The Enchanted Canyon by Honoré Willsie Morrow