Synonyms for Zenith:

adj.

limiting (adjective)
bounding, Restraining, Terminating, utmost, restricting, limiting, edge, extreme, constraining, confining, maximum.
summit (adjective)
Culminating, crowning, extreme, tip, apex, acme, uppermost, loftiest, maximum, summit, peak, Capping, Headmost, pinnacle, top, highest, topmost.
superior (adjective)
A 1, signal, superior, supreme, eminent, ruling, leading, maximum, master, most, best, dominant, elite, quintessential, chosen, chief, above, paramount, furthermost, foremost, predominant, commanding, senior, uppermost, consummate, ascendant, king, champion, crowning, Headmost, choice, sovereign, controlling, furthest, better.
top (adjective)
maximum height, altitude, culminating point, tiptop, apogee, eminence, elevation.

n.

someone's day in the sun, breakthrough, glory days, heyday, comeback, golden age, flowering. eclipse, height, sink, go in, fastigium, come up, orbit, payoff, wax, meridian, wane, high, go down, full moon, rise, apogee. heaven (noun)
mountaintop, shangri-la, climax, ecstasy, paradise, wonderland, afterworld, heaven, eden, rhapsody, ether, nirvana, eternity, happiness, goshen, stratosphere, everlastingness, pinnacle, fairyland, zion, dreamland, canaan, acme, summit, apex, glory, culmination, bliss, azure, hereafter, spire, immortality, joyfulness, land o'goshen.
height (noun)
height.
limit (noun)
bounds, deadline, limitation, cutoff, terminus, boundary, extremity, fringe, rim, end, restriction, edge, confines, brink, limit, border.
summit (noun)
uppermost point, brow, topmost point, highest point, cap, crown, crest.
top (noun)
tiptop, summit, crown, crest, climax, altitude, cap, meridian, payoff, eminence, acme, apogee, elevation, height, apex, roof, culmination, peak, pinnacle.

Other synonyms:

fastigium, payoff, apogee. meridian. height.

Usage examples for zenith

  1. Musing by those roaring logs perhaps he saw the radiant star of the Man of Destiny rise to its magnificent zenith – Betty Zane by Zane Grey
  2. And from its centre, true north, there grew out a monstrous human arm, reaching higher and higher, up to the zenith blotting the stars behind it. – Over Prairie Trails by Frederick Philip Grove
  3. As for the morale of the relieving force, it now stood at the zenith as was seen on the following day. – The Development of the European Nations, 1870-1914 (5th ed.) by John Holland Rose