Bottleneck and Rub

Bottleneck noun - A crowded mass (as of cars) that impedes or blocks movement.

Rub and bottleneck are semantically related. In some cases you can use "Rub" instead a noun "Bottleneck".

Rub noun - Something that is a source of irritation.

Bottleneck and rub are semantically related. Sometimes you can use "Bottleneck" instead a noun "Rub".