This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.
If a word conforms to a special rule, I call it a Mono Word™.
Use the following examples below to find the rule.
Text version:
VERB,NOUN
SALON,SALOON
MENTAT,MENTAL
BREW,DREW
NUMB,NAME
ALM,ALMA MATER
JUDGE,JUDGED
ARK,LARK
LOSS,LOSE
LEMON,MELON