Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun firestone

2 senses of firestone

Sense 1
firestone -- (a piece of flint that is struck to light a fire)
       => flint -- (a hard kind of stone; a form of silica more opaque than chalcedony)

Sense 2
firestone -- (a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns)
       => sandstone -- (a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.))