Answer: slate

AnswerCrossword Clue
SLATEMr. ... (Fred Flintstone's boss)
SLATEChalkboard material
SLATEPool table layer
SLATEGroup of candidates
SLATENovember ticket
SLATEChalkboard
SLATENominee list
SLATEList for electors
SLATEEasily split rock
SLATEPool table rock
SLATECandidate list
SLATETicket
SLATESchool board?
SLATEFlintstone boss
SLATEQuarry boss in Bedrock
SLATERock on the roof
SLATEFlintstone's boss
SLATEParty's candidates
SLATEGrayish shade
SLATEList of nominees
slatedense fine-grained metamorphic rock produced by the compression of various sediments (as clay or shale) so as to develop a characteristic cleavage
SLATERoofing option
SLATEList of candidates
SLATERoof material
SLATERoofing material
SLATEMetamorphic rock
SLATEPool table material
SLATEElectoral list
SLATEAgenda
SLATEFine-grained rock
SLATERoofing stone
SLATEBlackboard
SLATEPatio stone
SLATESchedule
SLATEIt's used to make black Go stones
SLATEOnline magazine owned by the Washington Post Company
SLATEOnline magazine
SLATEWalkway material
SLATEList of runners
SLATEPolitical ticket