Tin or copper (5)
I believe the answer is:
metal
I believe this is a double definition.
'tin' is the first definition.
(thesaurus)
'copper' is the second definition.
(I've seen this before)
(Other definitions for metal that I've seen before include "Aluminium or copper for instance" , "Zirconium, for example" , "Eg, Iron or gold" , "Eg, iron, lead" , "Gold or silver in heraldry" .)