Yield is a synonym of Depict. Depict is a synonym of Interpret. Sing is a type of Interpret. Voice can be used for Sing. 
Convince is a synonym of Assure. Assure is a different concept from Weaken. Weaken is a synonym of Undermine. 
Yield <--Synonym--> Depict <--Synonym--> Interpret <--IsA-- Sing <--UsedFor-- Voice 
Convince <--Synonym--> Assure <--DistinctFrom--> Weaken <--Synonym--> Undermine 