RYTDEIH
Reuse letters to make words (4+)
No names, places, natinalities
No words ending in -ED
No chemical compounds with hydrogen
DITHER DITHERER DITHERY EITHER ETHER HEED HEIR HERD HERE HEREDITY HIDE HIDER HIRE HIREE HIRER HITHER HITTER REHIRE TEETH TEETHE TETHER THEE THEIR THERE THEY THIRD THIRTIETH THIRTY THITHER THREE TITHE TITHER