The difference between Apex and Summit

Apex as a noun:

The "highest" or the greatest point of something.

Apex as a noun (figuratively):

The moment of greatest success, expansion, etc.

Apex as a noun (geometry):

The topmost vertex of a cone or pyramid (in their conventional orientation).

Apex as a noun (chiefly, anatomy):

The "pointed" fine end of something. The lowest part of the human heart. The deepest part of a tooth's root.

Apex as a noun (botany):

The end of a leaf, petal or similar organ opposed to the end where it is attached to its support; the tip.

Apex as a noun (astronomy):

The point on the celestial sphere toward which the sun appears to move relative to nearby stars.

Apex as a noun (physics):

The lowest point on a pendant drop of a liquid.

Apex as a noun (mining, US):

The end or edge of a vein nearest the surface.

Apex as a noun (typography):

A diacritic in Classical Latin that resembles and gave rise to the acute.

Apex as a noun (typography):

A diacritic in Middle Vietnamese that indicates .

Summit as a noun (countable):

A peak; the topmost point or surface, as of a mountain.

Summit as a noun (countable):

A gathering or assembly of leaders.

Summit as a verb (transitive, hiking, climbing, colloquial):

To reach the summit of a mountain.

Summit as a pronoun (Northern England, Yorkshire):

Something