TUNNEL is a playable word

tunnel Scrabble® Dictionary

verb
tunneled, tunneling, tunnels or tunnelled, tunnelling, tunnels
to dig a tunnel (an underground passageway)
27 Playable Words can be made from "TUNNEL"
   2-Letter Words (8 found)
   3-Letter Words (10 found)
   4-Letter Words (6 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)