OVERFILLING is a playable word

overfill Scrabble® Dictionary

verb
overfilled, overfilling, overfills
to fill to overflowing
333 Playable Words can be made from "OVERFILLING"
   2-Letter Words (19 found)
   9-Letter Words (2 found)
   10-Letter Words (1 found)
   11-Letter Words (1 found)