DUPLEX is a playable word

duplex Scrabble® Dictionary

verb
duplexed, duplexing, duplexes
to make duple
32 Playable Words can be made from "DUPLEX"
   2-Letter Words (7 found)
   3-Letter Words (14 found)
   4-Letter Words (8 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)