Yes, osmium is a Scrabble word!
...and is worth 10 points in Scrabble, and 13 points in Words with Friends
osmium
Noun
1. A hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
What Scrabble words can I make with the letters in osmium?
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Words that can be created with an extra letter added to osmium:
S:osmiums