peak, pinnacle
Pinnacle
The tip of a wave is called the crest. This is the highest point of the wave above the rest position.
epical, apex, top etc
apex
That would be the "Mushroom Tip." Rimshot. Source: Sublime
A Gift or a TIP.
The tip of a mountain is called a peak.
Tip of the ears
A notch
The tip of a pencil is called the nib.
Q- Tip tip
The metal plate that protects the tip of a scabbard or a belt is called the chape (it's French, so the pronunciation is something like "shahp").