CUCKOOS is a playable word

cuckoo Scrabble® Dictionary

verb
cuckooed, cuckooing, cuckoos
to repeat monotonously
25 Playable Words can be made from "CUCKOOS"
   2-Letter Words (4 found)
   3-Letter Words (6 found)
   4-Letter Words (9 found)
   5-Letter Words (4 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)