WordNet sense 1 (a predicament from which a skillful or graceful escape is impossible):

box

WordNet sense 2 (a small concavity):

niche, recess, recession, recess

WordNet sense 3 (an interior angle formed be two meeting walls):

nook

WordNet sense 4 ((architecture) solid exterior angle of a building; especially one formed by a cornerstone):

quoin

WordNet sense 5 (the intersection of two streets):

street corner, turning point

WordNet sense 6 (force a person or an animal into a position from which he cannot escape):

tree