Is “Substructure” a Scrabble word?
Yes
SUBSTRUCTURE
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 Substructure
noun
1.The supporting part of a structure (either physical or organizational; the foundation).
2.The earth or gravel that the railway tracks are embedded in.
Synonyms: underbuilding