SILTS is a playable word

silt Scrabble® Dictionary

verb
silted, silting, silts
to fill with silt (a sedimentary material)
21 Playable Words can be made from "SILTS"
   2-Letter Words (5 found)
   3-Letter Words (7 found)
   4-Letter Words (6 found)
   5-Letter Words (3 found)