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ARCHEAN
Archean (noun) — the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life. 2. (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon.
Archean is a valid 7-letter word worth 12 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.