Blocker and Obstacle

Blocker noun - A football player whose responsibility is to block players attempting to stop an offensive play.

Obstacle and blocker are semantically related in blockade topic. In some cases you can use "Obstacle" instead a noun "Blocker".

Obstacle noun - Something that makes movement or progress difficult.

Blocker and obstacle are semantically related in blockade topic. You can use "Blocker" instead a noun "Obstacle".