Answer: concrete

AnswerCrossword Clue
CONCRETENot metaphysical
concreteto solidify (to make solid (having definite shape and volume))
concreteto cover with concrete
concretebuilding material of cement and hard matter
concreteconstituting an actual thing; real
concretemade of concrete
CONCRETEConstruction material
CONCRETEFallout shelter material
CONCRETENot abstract
CONCRETEReal cold on Greek isle (8)
CONCRETENot imaginary
CONCRETETangible
CONCRETECity sidewalks
CONCRETEBasement floor material
CONCRETEActual
CONCRETEMason's material
CONCRETEPaving mixture
CONCRETESpecific
CONCRETEDam ingredient
CONCRETEBuilding material.
CONCRETEReal
CONCRETESolid, in a sense
CONCRETESidewalk material