I1R1I1D2O1S1M3I1U1M3S1
16 points
IRIDOSMIUMS is no goodvalid
Not a playable Scrabble word in NWL2023.
IRIDOSMIUM, a very hard corrosion-resistant white or grey natural alloy of osmium and iridium used esp. in pen nibs, also IRIDOSMINE, OSMIRIDIUM [n]