Letter Words

Ever noticed that an extremely small subset of all words can be made by phonetically pronouncing letters in the proper order?

NV        (Envy)
XTC        (Ecstasy)
NRG        (Energy)
BD        (Beady)
AT        (Eighty)
OK        (Okay)
NTT        (Entity)
MT        (Empty)
XL        (Excel)
FEG        (Effigy)
CD        (Seedy)
DK        (Decay)
KG        (Cagey)