HOLLOO is a playable word

holloo Scrabble® Dictionary

verb
hollooed, hollooing, holloos
to hallo
10 Playable Words can be made from "HOLLOO"
   2-Letter Words (3 found)
   3-Letter Words (4 found)
   4-Letter Words (1 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)