HOLLOS is a playable word

hollo Scrabble® Dictionary

verb
holloed, holloing, hollos or holloes
to hallo
24 Playable Words can be made from "HOLLOS"
   2-Letter Words (6 found)
   3-Letter Words (8 found)
   4-Letter Words (6 found)
   5-Letter Words (3 found)
   6-Letter Words (1 found)