FSMOPRI
Make words with I
Never: plural or third-person -S
FIRM IRIS ISOFORM MIFF MIOSIS MIRROR MISO MISS MISSIS MOMISM ORRIS OSMOSIS PIMP PISS PISSOIR POORI PRIM PRIMP PRIOR PRISM PROMISOR RIFF SISS SPIRIFORM
Pangrams: SPIRIFORM
score: 104