Pinnacle

1. noun

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

2. noun

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

   “his landscapes were deemed the acme of beauty”

   Similar: acme, height, elevation, peak, summit, superlative, meridian, tiptop, top

3. noun

   a lofty peak