Bottleneck and Drawback

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

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

Drawback noun - A feature of someone or something that creates difficulty for achieving success.

Bottleneck and drawback are semantically related. Sometimes you can use "Bottleneck" instead a noun "Drawback".