eon

1. An indefinitely long period of time; an age.

2. The longest division of geologic time, containing two or more eras.

Here are some other words you could make with the letters eon, you can also
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Top Words by points	Points	Word Game
eon	3	Scrabble

2 Letters	Scrabble® Points
en	2
ne	2
no	2
oe	2
on	2

3 Letters	Scrabble® Points
eon	3
one	3