What is an MM 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.}

If a word conforms to a special rule, I call it an MM Word™.
Use the following examples below to find the rule.

These are just some examples of MM Words and there are probably more.

And, if you want to analyze, here is a CSV version:

MM Words™, Not MM Words™
DORY, MARLIN
EYES, EARS
FLAY, SKIN
RACY, ADULT
SPICY, SWEET
YELP, CRY
YIN, KARMA

At the moment, with the list of examples provided there's a rather basic rot13(pbagnvaf n L naq ng yrnfg bar NRVBH ibjry) rule going on. Are you able to add further examples which do not follow this seemingly trivial rule, or is that impossible by construction? — Stiv, Sep 20, 2019 at 10:19
I mean, if you can tie that rule to why OP has called it an ‘MM word’, then you might have your answer. If you can’t, you likely don’t have your answer! — El-Guest, Sep 20, 2019 at 10:42
@ElGuest Indeed. I just can't see past that letter at the moment and would like to know if it's by design or just total coincidence! — Stiv, Sep 20, 2019 at 11:23

Deusovi · Accepted Answer · 2019-09-20 15:05:19Z

11

An MM word is

one that contains a Y that can be replaced by a K to form a new word.

This is because

"MM" means "2000", and the transformation here is "Y-2-K".

answered Sep 20, 2019 at 15:05

Deusovi♦

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