O₁P₃I₁S₁T₁H₄O₁S₁O₁M₃A₁

18 points

OPISTHOSOMA is no goodvalid

Not a playable Scrabble word in NWL2023.

It is valid in CSW24·

the abdomen of a spider or other arachnid [n OPISTHOSOMATA]

164,264 of 280,887 in CSW24·not in NWL2023