Roadblock
Part of speech: noun
Definition: Something that blocks or obstructs a road. An obstacle or impediment.
Part of speech: verb
Definition: To prevent, hinder.
Example sentence: We're not living in a society that science actually dominates the conversation. We're living in a situation where some science is allowed and a lot of it's about policy. And when your science runs into a policy roadblock, all of a sudden the science starts to disappear.
Barricade
Part of speech: noun
Definition: a barrier constructed across a road, especially as a military defencean obstacle, barrier or bulwark
Part of speech: verb
Definition: to close or block a road etc., using a barricadeto keep someone in (or out), using a blockade, especially ships in a port