HALLOO is a playable word

halloo Scrabble® Dictionary

verb
hallooed, hallooing, halloos
to hallo
23 Playable Words can be made from "HALLOO"
   2-Letter Words (7 found)
   3-Letter Words (7 found)
   4-Letter Words (4 found)
   5-Letter Words (3 found)
   6-Letter Words (2 found)