apex

height, altitude, elevation; eminence, pitch; loftiness; sublimity., tallness; stature, procerity; prominence., colussus (size); giant, grenadier, giraffe, camelopard., mount, mountain; hill alto, butte [U.S.], monticle, fell, knap; cape; headland, foreland; promontory; ridge, hog's back, dune; rising ground, vantage ground; down; moor, moorland; Alp; uplands, highlands; heights (summit), [more]; knob, loma, pena [U.S.], picacho, tump; knoll, hummock, hillock, barrow, mound, mole; steeps, bluff, cliff, craig, tor, peak, pike, clough; escarpment, edge, ledge, brae; dizzy height, dizzying height., tower, pillar, column, obelisk, monument, steeple, spire, minaret, campanile, turret, dome, cupola., pole, pikstaff, maypole, flagstaff; top mast, topgallant mast., ceiling (covering)., high water; high tide, flood tide, spring tide., altimetry (angel); batophobia.

be high; tower, soar, command; hover; cap, culminate; overhang, hang over, impend, beetle, bestride, ride, mount; perch, surmount; cover; overtop (be superior); stand on tiptoe., become high; grow higher, grow taller; upgrow; rise (ascend)., render high; heighten (elevate).

high, elevated, eminent, exalted, lofty, tall; gigantic (big); Patagonian; towering, beetling, soaring, hanging [gardens]; elevated; upper; highest (topmost); high reaching, insessorial, perching., upland, moorland; hilly, knobby [U.S.]; mountainous, alpine, subalpine, heaven kissing; cloudtopt, cloudcapt, cloudtouching; aerial., overhanging ; incumbent, overlying, superincumbent, supernatant, superimposed; prominent., tall as a maypole, tall as a poplar, tall as a steeple; lanky (thin).

on high, high up, aloft, up, above, aloof, overhead; airwind; upstairs, abovestairs; in the clouds; on tiptoe, on stilts, on the shoulders of; over head and ears; breast high., over, upwards; from top to bottom (completely).

summit, summity; top, vertex, apex, zenith, pinnacle, acme, culmination, meridian, utmost height, ne plus ultra, height, pitch, maximum, climax, culminating point, crowning point, turning point; turn of the tide, fountain head; watershed, water parting; sky, pole., tip, tip top; crest, crow's nest, cap, truck, peak, nib; end; crown, brow; head, nob, noddle, pate; capsheaf., high places, heights., topgallant mast, skyscraper; quarter deck, hurricane deck., architrave, frieze, cornice, coping stone, zoophorus, capital, epistyle, sconce, pediment, entablature; tympanum; ceiling (covering)., attic, loft, garret, house top, upper story.

culminate, crown, top; overtop (be superior to).

highest (high [more]); top; top most, upper most; tiptop; culminating; meridian, meridional; capital, head, polar, supreme, supernal, topgallant.

atop, at the top of the tree.