Yes, lava is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
lava
Noun
1. Rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
What Scrabble words can I make with the letters in lava?
3 Letter Words
2 Letter Words