pinnacle - noun

(architecture) a slender upright spire at the top of a buttress of tower

the highest level or degree attainable; the highest stage of development

a lofty peak

pinnacle - verb

• surmount with a pinnacle
• raise on or as if on a pinnacle

pinnacle - thesaurus

acme   elevation   height   meridian   peak   summit   superlative   tiptop   top