What is a Mono Word™?

Question

_{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.}

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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

Answer 1

Mono words:

Can be found in the names of books of the Bible.

Thus:

VERB in PROVERBS
SALON in 1&2 THESSALONIANS
MENTAT in LAMENTATIONS
BREW in HEBREWS
NUMB in NUMBERS
ALM in PSALMS
JUDGE in JUDGES
ARK in MARK
LOSS in COLOSSIANS
LEMON in PHILEMON

As for the name:

Possibly because Christianity is a MONOtheistic religion? Or because of SONG OF SOLOMONOMONOMON... ;-)