what is the place of this word "copper" in the following sentence?<br/><br/>The ideal choice, when isotopic composition is used to investigate the source of copper ore, would seem to be <b>copper</b> itself.<br/><br/>verb or noun? <i>Copper</i> word in the <a href='http://www.oxforddictionaries.com/us/definition/american_english/copper' target='_blank' rel='nofollow'>Oxford Dictionary</a> is a verb and noun.<br/><br/><a href='https://www.englishforums.com/English/httpgrekaomanfencomlearnpractiseu139485781872-202308140905079373'>http://gre.kaomanfen.com/learn/practise/u139485781872</a>