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This puzzle is based off the What is a Word™ and What is a Phrase™ series started by JLee and their spin-off What is a Number™ series.

If a word conforms to a certain rule, I call it an Eternal Word™. Use the following examples to find the rule:

$$ % set Title text. (spaces around the text ARE important; do not remove.) % increase Pad value only if your entries are longer than the title bar. % \def\Pad{\P{0.0}} \def\Title{\textbf{ Eternal }} % \def\S#1#2{\Space{#1}{20px}{#2px}}\def\P#1{\V{#1em}}\def\V#1{\S{#1}{9}} \def\T{\Title\textbf{Words}^{\;\!™}\Pad}\def\NT{\Pad\textbf{Not}\T\ }\displaystyle \smash{\lower{29px}\bbox[yellow]{\phantom{\rlap{rubio.2019.05.15}\S{6px}{0} \begin{array}{cc}\Pad\T&\NT\\\end{array}}}}\atop\def\V#1{\S{#1}{5}} \begin{array}{|c|c|}\hline\Pad\T&\NT\\\hline % \text{ASKING}&\text{ANSWERING}\\ \hline \text{ATARI}&\text{KONAMI}\\ \hline \text{NINTENDO}&\text{SEGA}\\ \hline \text{ASTEROIDS}&\text{PACMAN}\\ \hline \text{RACHEL}&\text{MONICA}\\ \hline \text{CHANDLER}&\text{PHOEBE}\\ \hline \text{PINK}&\text{FUCHSIA}\\ \hline \text{MAGENTA}&\text{LAVENDER}\\ \hline \text{EARTH}&\text{PLUTO}\\ \hline \text{DWARF}&\text{MIDGET}\\ \hline \text{PLANET}&\text{PLANETOID}\\ \hline \text{70}&\text{69}\\ \hline \text{PROPER}&\text{IMPROPER}\\ \hline \text{FACTORY}&\text{FACTOR}\\ \hline \text{FLATTER}&\text{FATTER}\\ \hline \end{array}$$


The puzzle satisfies the series' inbuilt assumption, that each word can be tested for whether it is an Eternal Word™ without relying on the other words.

These are not the only examples, there are more of both Eternal Words™ and Not Eternal Words™.

CSV version:

ASKING,    ANSWERING
ATARI,     KONAMI
NINTENDO,  SEGA
ASTEROIDS, PACMAN
RACHEL,    MONICA
CHANDLER,  PHOEBE
PINK,      FUCHSIA
MAGENTA,   LAVENDER
EARTH,     PLUTO
DWARF,     MIDGET
PLANET,    PLANETOID
70,        69
PROPER,    IMPROPER
FACTORY,   FACTOR
FLATTER,   FATTER
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31
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An Eternal Word™ is

a word where you can remove the first and last letter to produce another word.

ASKING → SKIN
ATARI → TAR
NINTENDO → INTEND
ASTEROIDS → STEROID
RACHEL → ACHE
CHANDLER → HANDLE
PINK → IN
MAGENTA → AGENT
EARTH → ART
DWARF → WAR
PLANET → LANE
SEVENTY → EVENT
PROPER → ROPE
FACTORY → ACTOR
FLATTER → LATTE

The name:

"Eternal" means "without end", and you can make new words by removing both ends of an Eternal Word™.

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  • 2
    $\begingroup$ that was fast. +1 $\endgroup$ – Omega Krypton Jul 24 at 9:20
  • $\begingroup$ (+1): wow, well done! :P $\endgroup$ – Mr Pie Jul 24 at 9:51
  • 2
    $\begingroup$ How is 70 eternal then? $\endgroup$ – Eugene Jul 24 at 23:55
  • $\begingroup$ @Eugene Perhaps rot13(Friragl → rirag)? $\endgroup$ – Michael Jul 25 at 6:05
  • 1
    $\begingroup$ @Eugene I suspect it's meant to be spelled out as SEVENTY $\endgroup$ – Syndic Jul 25 at 8:42

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