What is a Mostly Ruddy 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 a Mostly Ruddy Word™.
Use the following examples below to find the rule.

Mostly Ruddy Words™
Not Mostly Ruddy Words™

NAMETAG
IDENTIFICATION

RAILWAY
TRACK

WHIMPER
BLUBBER

WATERJET
AIRJET

MONOLOGUE
SPEECH

INDULGE
ENTERTAIN

ZOOLOGY
MEDICINE

ALLERGEN
IRRITANT

SCALLOPS
CRAWFISH

CLOUDSCAPE
SCENERY

SOLILOQUY
DISCOURSE

BOOKKEEPER
LIBRARIAN

HALLELUJAH*
ALLELUIA

STYLOGRAPHY**
ELABORATENESS

* Showing off
** Impractical
And, if you want to analyze, here is a CSV version:

Mostly Ruddy Words™,Not Mostly Ruddy Words™
NAMETAG,IDENTIFICATION
RAILWAY,TRACK
WHIMPER,BLUBBER
WATERJET,AIRJET
MONOLOGUE,SPEECH
INDULGE,ENTERTAIN
ZOOLOGY,MEDICINE
ALLERGEN,IRRITANT
SCALLOPS,CRAWFISH
CLOUDSCAPE,SCENERY
SOLILOQUY,DISCOURSE
BOOKKEEPER,LIBRARIAN
HALLELUJAH,ALLELUIA
STYLOGRAPHY,ELABORATENESS

Addition 1:

Addition 2:

finsternis · Accepted Answer

The simple transformation is

Then a mostly word is

and a ruddy word is

and a mostly ruddy word is

I think mostly ruddy refers to

Areeb · Answer

Not a complete answer:

It didn't follow the pattern for some words. This is probably a dead end, it might inspire someone though.

ToTheMax · Answer

What is a Mostly Ruddy Word™?

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Mostly Ruddy Words™	Not Mostly Ruddy Words™
NAMETAG	IDENTIFICATION
RAILWAY	TRACK
WHIMPER	BLUBBER
WATERJET	AIRJET
MONOLOGUE	SPEECH
INDULGE	ENTERTAIN
ZOOLOGY	MEDICINE
ALLERGEN	IRRITANT
SCALLOPS	CRAWFISH
CLOUDSCAPE	SCENERY
SOLILOQUY	DISCOURSE
BOOKKEEPER	LIBRARIAN
HALLELUJAH*	ALLELUIA
STYLOGRAPHY**	ELABORATENESS