"ruts" in the noun sense
a groove or furrow (especially one in soft earth caused by wheels)
2. rut, groove
a settled and monotonous routine that is hard to escape
"they fell into a conversational rut"
3. estrus, oestrus, heat, rut
applies to nonhuman mammals: a state or period of heightened sexual arousal and activity
"ruts" in the verb sense
be in a state of sexual excitement of male mammals
2. furrow, rut, groove
hollow out in the form of a furrow or groove
Source: WordNet® (An amazing lexical database of English)
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