der Kegel
pin
One of the nine wooden or plastic figures that have to be knocked over with a ball in nine-pin bowling.
Mit einem Wurf hat er alle neun Kegel abgeräumt.
With one throw, he knocked down all nine pins.

pin / cone
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pin
One of the nine wooden or plastic figures that have to be knocked over with a ball in nine-pin bowling.
Mit einem Wurf hat er alle neun Kegel abgeräumt.
With one throw, he knocked down all nine pins.

You can recognize the meaning of 'Kegel' from the context. Words like 'umwerfen' (to knock over) or 'Bahn' (lane/alley) point to the sport, 'berechnen' (to calculate) or 'Volumen' (volume) to geometry, and 'Straße' (street/road) or 'absperren' (to block off) to traffic.
Er warf den Kegel mit voller Wucht um.
He knocked over the pin with full force.
'Kegel' is the basis for many compound words that make the meaning more precise. Examples are 'Verkehrskegel' (traffic cone), 'Lichtkegel' (beam/cone of light), or 'Kegelbahn' (bowling alley).
Der Scheinwerfer warf einen hellen Lichtkegel an die Wand.
The spotlight cast a bright cone of light on the wall.
In nine-pin bowling, there is the fixed expression 'alle Neune treffen' or 'alle Neune abräumen' (to hit/clear all nine). It means that you have knocked over all nine pins with one throw.
Wow, du hast mit einem Wurf alle Neune getroffen!
Wow, you hit all nine with one throw!
In a traffic context, cones are typically 'aufgestellt' (set up) in order to 'absperren' (block off) an area or 'umzuleiten' (reroute) traffic.
Wegen des Unfalls musste die Polizei die Fahrspur mit Kegeln absperren.
Because of the accident, the police had to block off the lane with traffic cones.
cylinder / top hat
'Zylinder' and 'Kegel' can both be geometric solids with a round base. The important difference is in the shape: a cylinder has two equally sized, parallel circular faces and straight sides. A cone has only one circular face and comes to a point at the top. Learners may confuse the words because both look round and appear in mathematics or technology. As a memory aid: a 'Zylinder' is like a can, while a 'Kegel' is like an ice cream cone.

Auf dem Arbeitsblatt endet der Kegel oben in einer Spitze.
On the worksheet, the cone comes to a point at the top.
Im Mathekurs zeichnet Ali einen Zylinder mit zwei runden Flächen.
In math class, Ali draws a cylinder with two round faces.