Yes, rut is a Scrabble word!

Verb

1. Be in a state of sexual excitement; of male mammals

2. Hollow out in the form of a furrow or groove

Noun

1. A groove or furrow (especially one in soft earth caused by wheels)

2. A settled and monotonous routine that is hard to escape

3. Applies to nonhuman mammals: a state or period of heightened sexual arousal and activity