Yes, tomb is a Scrabble word!
...and is worth 8 points in Scrabble, and 10 points in Words with Friends
tomb
Noun
1. A place for the burial of a corpse (especially beneath the ground and marked by a tombstone)
What Scrabble words can I make with the letters in tomb?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to tomb:
S:tombs