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If a word conforms to a special rule I call it an Origamic Word™

Origamic Words™ Not Origamic Words™
YAHOO GOOGLE
VICTIM MURDER
TWO ONE
HAWK FALCON
MAMMOTH ELEPHANT
ITCHY MOSQUITO
DIET PIZZA
COKE SPRITE
ADDICTIVE HEROIN
WHAMMY CHRISTMAS

The CSV version:

Origamic Words™, Not Origamic Words™
YAHOO, GOOGLE
VICTIM, MURDER
TWO, ONE
HAWK, FALCON
MAMMOTH, ELEPHANT
ITCHY, MOSQUITO
DIET, PIZZA
COKE, SPRITE
ADDICTIVE, HEROIN
WHAMMY, CHRISTMAS

Can you tell me what the rule is?

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An Origamic Word™ is a word ...

... where all letters are axisymmetric in their capital form. These are the letters A, C, D, E, H, I, K, M, O, T, V, W, Y. The letters S, N and Z have rotational symmetry and are not allowed in Origamic Words™. Whether the symmetry axis is vertical or horizontal doesn't matter.

The are called Origamic™, because ...

... one half of the letter can be folded onto the other, as in origami, the Japanese paper-folding technique.

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  • $\begingroup$ lightning fast... Hope you don't mind If I hold off the tick. Upvoted $\endgroup$
    – bolt997
    Aug 4 '17 at 8:58
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    $\begingroup$ The letters"B", "U", and "X also can be folded. $\endgroup$ Aug 5 '17 at 3:49
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Well, I guess

an Origamic word, which is formed by letters having either horizontal or vertical symmetry. Example: ECHO

and

Non-origamic words do not exhibit this property in at least one of its letters.

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  • 1
    $\begingroup$ This was posted more than two hours after M Oehm's answer and states the same rule. Before posting an answer, please check that it does actually add something new. Thanks! $\endgroup$
    – Gareth McCaughan
    Aug 15 '17 at 11:42

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