Feat or document (4)
I believe the answer is:
deed
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">feat</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">document</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(deed is a kind of document)</span><br/ ><br/ ></span>
(Other definitions for deed that I've seen before include "Legal document for transfer of property" , "Something done" , "Intentional action" , "Heroic exploit" , "What's done" .)