HULLOS is a playable word

hullo Scrabble® Dictionary

verb
hulloed, hulloing, hullos or hulloes
to hallo
21 Playable Words can be made from "HULLOS"
   2-Letter Words (8 found)
   3-Letter Words (5 found)
   4-Letter Words (5 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)