[English Etymology] *kadh- "cover, protect"

*kadh-  "cover, protect"


Eng hat
  ß Old English hæt "hat, head covering"  
     ß Proto-Germanic *hattuz "hood, cowl"


Eng heed
  ß Old English hedan "observe; to take care, attend, care for, protect, take charge of," 
      ß West Germanic *hodjan