Mountained is valid Scrabble Word

Is mountained a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is mountained valid Words with Friends?
Words with Friends YES

Definitions for MOUNTAINED in dictionary:

Similar words containing MOUNTAIN without suffix ed

mountain10 mountains11 mountainy14 mountaineer13 mountainous13 mountaintop15 mountainier13 catamountain16 mountaineers14 mountainside15 mountaintops16 mountainiest14 catamountains17 intermountain15 mountainboard18 mountaineered16 mountainously18 mountainsides16 transmountain15 mountainboards19 mountaineering17 mountainboarder20 mountaineerings18 mountainousness17 mountainousnesses19
Find what other words can be done using letters: "mountained"
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