HULLOO is a playable word

hulloo Scrabble® Dictionary

verb
hullooed, hullooing, hulloos
to hallo
13 Playable Words can be made from "HULLOO"
   2-Letter Words (4 found)
   3-Letter Words (4 found)
   4-Letter Words (2 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)