TSOIQUM
Make words with M
No -S plurals
No -S third-person verbs
Sorry about earlier screwup
MIOSIS MISS MISSOUT MISSUS MIST MITOSIS MITT MOIST MOOT MOSQUITO MOSS MOST MOTTO MUST MUTT OMIT OSMIUM OSMOSIS OUTMOST QUIM SMUT STIM STUM SUMMIT SUMO TOMTOM UTMOST MISO