MAINLINING is a playable word

mainline Scrabble® Dictionary

verb
mainlined, mainlining, mainlines
to inject a narcotic into a major vein
88 Playable Words can be made from "MAINLINING"
   2-Letter Words (12 found)
   3-Letter Words (22 found)
   5-Letter Words (10 found)
   7-Letter Words (6 found)
   10-Letter Words (1 found)