3. Superficial form
[Nouns] closure, occlusion, blockade; shutting up; obstruction (hindrance) [more]; embolus; contraction [more]; infarction; constipation, obstipation; blind alley, blind corner; keddah; cul-de-sac, caecum; imperforation, imperviousness; impermeability; stopper [more].
[Verbs] close, occlude, plug; block up, stop up, fill up, bung up, cork up, button up, stuff up, shut up, dam up; blockade, obstruct (hinder) [more]; bar, bolt, stop, seal, plumb; choke, throttle; ram down, dam, cram; trap, clinch; put to the door, shut the door.
unpierced, imporous, caecal; closable; imperforate, inpervious, impermeable; impenetrable; unpassable, impassable; invious; pathless, wayless; untrodden.
unventilated; airtight, watertight; hermetically sealed; tight, snug.