Top

APEX

Think of the highest point on a geometric shape or the peak of a mountain—this word is often used in science and architecture.

"Top" is a straightforward clue where the answer is a synonym—"apex" means the highest point or peak of something. There’s no hidden wordplay here; it’s a direct definition often used in geometry, nature (like a mountain’s apex), or even rankings. If you think of "top" as the very tip or summit, "apex" fits perfectly. Simple and clean!