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Synonyms
pin·na·cle (pĭńə-kəl)

[Middle English, from Old French, from Late Latin pinnāculum, diminutive of Latin pinna, feather.]

noun 

  1. Architecture A small turret or spire on a roof or buttress.
  2. A tall pointed formation, such as a mountain peak.
  3. The highest point; the culmination. See synonyms at summit

transitive verb: -cled, -cling, -cles. 

  1. To furnish with a pinnacle.
  2. To place on or as if on a pinnacle.