Is “Superphosphate” a Scrabble word?
Yes
SUPERPHOSPHATE
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 Superphosphate
noun
1.A fertilizer produced by the action of concentrated sulfuric acid on powdered phosphate rock.
2.A phosphate containing the greatest amount of phosphoric acid that can combine with the base.