TELNET is a playable word

telnet Scrabble® Dictionary

verb
telnetted, telnetting, telnets or telneted, telneting, telnets
to access an account over the Internet using an appropriate procedure
24 Playable Words can be made from "TELNET"
   2-Letter Words (5 found)
   3-Letter Words (9 found)
   4-Letter Words (7 found)
   5-Letter Words (1 found)
   6-Letter Words (2 found)