apex

/ˈā-ˌpeks/

Latin

noun

  1. the uppermost point : vertex

  2. the narrowed or pointed end : tip

  3. the highest or culminating point

the apex of a mountain

the apex of the tongue

summit peak pinnacle climax apex acme culmination mean the highest point attained or attainable. summit implies the topmost level attainable. peak suggests the highest among other high points.