Is “Combust” a Scrabble word?
Yes
COMBUST
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Combust
noun
1.That which undergoes burning.
verb
1.To burn; to catch fire.
2.To erupt with enthusiasm or boisterousness.
adjective
1.Burnt.
2.In close conjunction with the sun (so that its astrological influence is "burnt up"), sometimes specified to be within 8 degrees 30'.