m 3 o 1 t 1 o 1 r 1 m 3 o 1 u 1 t 1 h 4
10 letters · 17 points in Scrabble
Meaning
noun someone who talks incessantly
originFrom motor + mouth, from the figurative notion that the mouth moves so much that it seems motorized.
Etymology from Wiktionary, CC BY-SA 3.0