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.
Barrier
Part of speech: noun
Definition: A structure that bars passage.An obstacle or impediment.A boundary or limit.
Example sentence: But once the ants and termites jumped the high barrier that prevents the vast variety of evolving animal groups from becoming fully social, they dominated the world.