groove

noun

1
a settled and monotonous routine that is hard to escape
they fell into a conversational rut
2
(anatomy) any furrow or channel on a bodily structure or part
3
a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)

Also useful for “groove”:Scrabble— High-value letters — see what it scores