金石で終わる言葉

きんせき【金石】

1〔鉱物〕minerals and rocks2〔金属器と石器〕metal and stone utensils3〔石碑〕a stone monument with an inscription...

しきんせき【試金石】

a touchstone；〔試験〕a test (case)この企画は彼の腕を試す試金石となるThis project will serve as a test of his ability.／...