Synonyms for Summit:

adj.

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

n.

accomplishment, conquest, the fruit/fruits of something, mountain, achievement, a feather in your cap, handiwork, realization, attainment, feat. briefing, colloquium, conclave, AGM, audience, consummation, audioconferencing, appointment, annual meeting. cairn, escarpment, brink, divide, crag, Brae, the brow. council (noun)
chamber, assembly, panel, forum, parliament, convention, symposium, legislature, congress, council, court, congregation, conference, meeting, faction, inquisition, league, coalition, cadre, tribunal, quorum, cabinet, committee, board, caucus, body.
heaven (noun)
culmination, rhapsody, nirvana, everlastingness, climax, eternity, land o'goshen, mountaintop, paradise, azure, spire, ecstasy, immortality, zenith, apex, dreamland, hereafter, glory, shangri-la, afterworld, ether, pinnacle, happiness, eden, wonderland, heaven, bliss, zion, joyfulness, fairyland, stratosphere, acme, goshen, canaan.
height (noun)
height.
summit (noun)
crown, acme, highest point, peak, height, crest, pinnacle, elevation, tip, extremity, uppermost point, superlative, summit meeting, brow, topmost point, top, cap, limit.
top (noun)
elite, roof.
top, crowning point (noun)
acme, height, peak, apex, culmination, roof, pinnacle, climax, crown, crest, zenith.
tower (noun)
spire.

Other synonyms:

attainment, realization, feat, handiwork, achievement, conquest. accomplishment. Other relevant words:
conclave, height, audience, superlative, mountain, escarpment, elevation, summit meeting, attainment, crag, feat, consummation, handiwork, accomplishment.

Usage examples for summit

  1. Once they caught sight of men running in the path below them, and presently of others climbing the hillside to reach the summit before them, but no shout told them that they themselves had been seen. – Princess Maritza by Percy Brebner
  2. As soon as we are on the summit of this next hill we shall descend to it." – Newton Forster by Frederick Marryat