Answer:

CONCRETE

AnswerCrossword Clue
CONCRETECity sidewalks
CONCRETESidewalk material
CONCRETESolid, in a sense
CONCRETEReal
CONCRETEBuilding material.
CONCRETEDam ingredient
CONCRETESpecific
CONCRETEPaving mixture
CONCRETEMason's material
CONCRETEActual
CONCRETEBasement floor material
CONCRETENot metaphysical
CONCRETETangible
CONCRETENot imaginary
CONCRETEReal cold on Greek isle (8)
CONCRETENot abstract
CONCRETEFallout shelter material
CONCRETEConstruction material