13 letters · 20 points in Scrabble
noun a person serving no apparent function
noun a minor actor in crowd scenes
adjective more than is needed, desired, or required
originFrom Late Latin supernumerarius (“extra soldier added to a legion; supernumerary”), from super (“above; beyond”) + numerus (“number; collection, quantity”) + -ārius (suffix forming adjectives from nouns or numerals). The word is analysable as super- + numeral + -ary.
Etymology from Wiktionary, CC BY-SA 3.0