7 letter words:
hydroid15,
6 letter words:
hydrid14,
5 letter words:
hydro12,
hyoid12,
droid7,
4 letter words:
yodh11,
didy9,
dory8,
yird8,
dido6,
3 letter words:
hoy9,
dry7,
hid7,
hod7,
yid7,
yod7,
rho6,
did5,
odd5,
dor4,
rid4,
rod4,
2 letter words:
hi5,
ho5,
oh5,
oy5,
yo5,
do3,
id3,
od3,
oi2,
or2,