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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 ABC Word™.
Your mission, should you choose to accept, is to find the rule that decides whether a word is an ABC Word™ or not, and why they are called so.

ABC Word™ Non-ABC Word™
PYJAMAS TROUSERS
TWEET POST
FROLIC WORK
VAMP LADY
WHEN HOW
COLORFUL DRAB
SPASM PEACEFUL
FULFIL NEGLECT
TENT HOUSE
GAMMA ALPHA

CSV Version:

ABC Word™,Non-ABC Word™
PYJAMAS,TROUSERS
TWEET,POST
FROLIC,WORK
VAMP,LADY
WHEN,HOW
COLORFUL,DRAB
SPASM,PEACEFUL
FULFIL,NEGLECT
TENT,HOUSE
GAMMA,ALPHA

Hint:

Maybe assigning numbers to the letters will help you see a pattern.

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The solution is:

Assign each letter a number from 1-26: A=1, B=2 etc

Next we

group letters that are equivalent modulo 3. Thus we have three groups ADGJMPSVY, BEHKNQTWZ, CFILORUX

An ABC word is

any word using only letters from one group

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  • $\begingroup$ Good show! That's correct! For more clarity behind the name, if you write the letters in a grid format with three columns, the top row reads ABC, and then the rule is that you make words from a single column. $\endgroup$ – Kabir Kanha Arora Jun 13 at 15:45

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