Definitions of brook:

• noun:   a natural stream of water smaller than a river (and often a tributary of a river)
• verb:   put up with something or somebody unpleasant
• name:  A female given name (rare: 1 in 25000 females; popularity rank in the U.S.: #1454)
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5133)