THESAURUS
Peak
acme, acme of perfection, all, allophone, alp, alveolar, apex, apico-alveolar, apico-dental, apogee, articulation, aspiration, assimilation, be poised, bilabial, bill, billow, boom, bore, bottoming out, break, breakers, brim, brow, business cycle, business fluctuations, bust, cacuminal, cap, capstone, ceiling, cerebral, check, chop, choppiness, chopping sea, climax, cloud nine, cog, comb, comber, consonant, consummate, consummation, continuant, cooling off, crag, crash, crest, crisis, crown, culmen, culminate, culmination, dash, decline, dental, depression, diphthong, dirty water, dissimilation, downturn, droop, dwindle, eagre, ebb and flow, economic cycle, economic expansion, economic growth, edge, elevation, eminence, end, epenthetic vowel, expanding economy, expansion, explosive, extreme, extreme limit, extremity, fade, fail, fang, flag, frost, glide, glottal, glottalization, gravity wave, ground swell, growth, guttural, harrow, head, heave, heaven, heavens, heavy sea, heavy swell, height, high growth rate, high noon, high point, highest degree, highest pitch, highest point, hill, hilltop, ice, jag, knoll, labial, labialization, labiodental, labiovelar, languish, laryngeal, last word, lateral, lift, limit, lingual, liquid, lofty peak, lop, lose strength, low, manner of articulation, market expansion, maximum, meridian, modification, monophthong, morphophoneme, mount, mountain, mountaintop, mute, nasal, ne plus ultra, nib, no place higher, noon, nth degree, occlusive, outtop, overarch, overtop, palatal, parasitic vowel, peaking, pecten, perfection, pharyngeal, pharyngealization, phone, phoneme, pic, pico, pike, pine, pink, pink of perfection, pinnacle, pitch, plosive, point, pole, popple, precipice, projection, prosperity, prothetic vowel, rake, ratchet, recession, recovery, retroflex, ridge, riffle, ripple, rise, rise and fall, roll, roller, roof, rough water, run down, sawtooth, scend, sea, segmental phoneme, semivowel, send, seventh heaven, sink, sky, slowdown, slump, smash, snag, snaggle, sonant, sonority, speech sound, spire, sprocket, spur, steeple, stop, summit, surd, surf, surge, surmount, swell, syllabic nucleus, syllabic peak, syllable, the whole, tidal bore, tidal wave, tide wave, tip, tip-top, tooth, top, top off, top out, tor, toss, transition sound, triphthong, trough, tsunami, ultimate, undulate, undulation, upmost, upper extremity, uppermost, upturn, utmost, utmost extent, uttermost, velar, vertex, very top, visor, vocable, vocalic, vocoid, voice, voiced sound, voiceless sound, voicing, vowel, waste, waste away, water wave, wave, wavelet, weaken, white horses, whitecaps, wilt, wither, wither away, zenith
ROGET THESAURUS
Peak
Disease
VB
V, be ill, ail, suffer, labor under, be affected with, complain of, have, droop, flag, languish, halt, sicken, peak, pine, gasp, keep one's bed, feign sickness, lay by, lay up, take a disease, catch a disease, catch an infection, break out.
Height
N
height, altitude, elevation, eminence, pitch, loftiness, sublimity, tallness, stature, procerity, prominence, colossus, giant, grenadier, giraffe, camelopard, mount, mountain, hill alto, butte, monticle, fell, knap, cape, headland, foreland, promontory, ridge, hog's back, dune, rising ground, vantage ground, down, moor, moorland, Alp, uplands, highlands, heights, knob, loma, pena, picacho, tump, knoll, hummock, hillock, barrow, mound, mole, steeps, bluff, cliff, craig, tor, peak, pike, clough, escarpment, edge, ledge, brae, dizzy height, tower, pillar, column, obelisk, monument, steeple, spire, minaret, campanile, turret, dome, cupola, skyscraper, pole, pikestaff, maypole, flagstaff, top mast, topgallant mast, ceiling, high water, high tide, flood tide, spring tide, altimetry, batophobia, satellite, spy-in-the-sky, high, elevated, eminent, exalted, lofty, tall, gigantic, Patagonian, towering, beetling, soaring, hanging (gardens), elevated, upper, highest, high reaching, insessorial, perching, upland, moorland, hilly, knobby, 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, 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, e meglio cader dalle finistre che dal tetto.
Summit
N
summit, summity, top, peak, vertex, apex, zenith, pinnacle, acme, culmination, meridian, utmost height, ne plus utra, height, pitch, maximum, climax, culminating point, crowning point, turning point, turn of the tide, fountain head, water shed, water parting, sky, pole, tip, tip top, crest, crow's nest, cap, truck, nib, end, crown, brow, head, nob, noddle, pate, capsheaf, high places, heights, topgallant mast, sky scraper, quarter deck, hurricane deck, architrave, frieze, cornice, coping stone, zoophorus, capital, epistyle, sconce, pediment, entablature, tympanum, ceiling, attic, loft, garret, house top, upper story, summit conference, summit, peak of achievement, peak of performance, peaks and troughs, peaks and valleys (in graphs), highest &c (high), top, top most, upper most, tiptop, culminating, meridian, meridional, capital, head, polar, supreme, supernal, topgallant, atop, at the top of the tree, en flute, fleur deau.