Crossword puzzle clue "corners have these"

Corners have these

One of the corners at Four Corners Monument

There used to be a lot more of these on corners

They have corners but still roll

What words that are fun to clue in crosswords usually have ... and what appear in each of this puzzle's four corners

Actor who said "Some people have youth, some have beauty—I have menace"

Sounds you might make when I say "Would you rather watch your parents have sex or have your parents watch you have sex?"

These have more decibels than words