Act, feat (4)
I believe the answer is:
deed
I believe this is a double definition.
'act' is the first definition.
(I know that act can be written as deed)
'feat' is the second definition.
(synonyms)
(Other definitions for deed that I've seen before include "Legal document for transfer of property" , "documentary evidence" , "Intentional action" , "Something done" , "Feat" .)