8 letters · 10 points in Scrabble
noun official (in tennis, soccer, football, etc.) who assists the referee in some way (especially by watching for out of bounds or offside)
noun a person who installs or repairs electrical or telephone lines
originEtymology tree English line English -s- English -man English linesman From line + -s- + -man.
Etymology from Wiktionary, CC BY-SA 3.0