Contraction of decimal exponent.
dex (plural dexes)
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You can also try words with the phrase DEX, words starting with the letters DEX, or words ending in the letters DEX.
Words… ending with q, starting with q, starting with qa, starting with qo, with two letters, starting with x, starting with j, ending with j,
Some random searches:
BIY, NNGO, OLCIF, NXRA, VUPTZG, UMBI,