# What is an Ordered Word™?

If a word conforms to a special rule, I call it an Ordered Word™.

Use the examples below to find the rule.

Ordered Words™ Not Ordered Words™
CAT DOG
BACK FRONT
NO YES
BEST WORST
DEMON ANGEL
FELL ROSE
TEA COFFEE
ONE TWO
WOOF MEOW
LIE TRUTH

CSV Version:

Ordered Words™,Not Ordered Words™
CAT,DOG
BACK,FRONT
NO,YES
BEST,WORST
DEMON,ANGEL
FELL,ROSE
TEA,COFFEE
ONE,TWO
WOOF,MEOW
LIE,TRUTH


What is the rule?
There are many more Ordered Words™

Subtle Hint:

Those born in 90's are more likely to know this rule.

• Looks like someone used this puzzle as inspiration for a Programming Puzzles & Code Golf question. Nice! (FYI: The link to the question contains spoilers to this puzzle.) Commented Aug 1, 2017 at 1:05

I think an ordered word is one which

Is created by pressing buttons on a phone keypad, in order of number size, in one direction.

To type the not ordered words, you need to increase the number size and then decrease, or vice-versa. P.S. - I was born in the 60's

The relevant pattern is given by

2 → ABC
3 → DEF
4 → GHI
5 → JKL
6 → MNO
7 → PQRS
8 → TUV
9 → WXYZ

• For best or tea you couldn't do this on keypad in one direction but would work if you just had 2-9 in one line Commented Jul 31, 2017 at 10:34
• Thanks @BMS21 - I updated answer to clarify the order is in terms of number size.
– Tom
Commented Jul 31, 2017 at 10:43
• @BMS21 unless you had a Nokia 3650 :) Commented Jul 31, 2017 at 11:54
• You forgot to say that the direction changes for each word in this model. I.e. a word can be mapped on either increasing or decreasing ordinal value, but always consistently one of those. Commented Aug 1, 2017 at 7:35