Fir and Verdigris

Fir noun - Any of various evergreen trees of the genus Abies; chiefly of upland areas.

Verdigris and fir are semantically related In some cases you can use "Verdigris" instead an adjective "Fir".

Verdigris noun - A green patina that forms on copper or brass or bronze that has been exposed to the air or water for long periods of time.

Fir and verdigris are semantically related in emerald in color topic. You can use "Fir" instead an adjective "Verdigris".