Bull is the opposite of Cow. Cow is a synonym of Discourage. Discourage is the opposite of Recommend. 
Listen is related to Perceive. Perceive is etymologically related to Capable. 
Bull <--Antonym--> Cow <--Synonym--> Discourage <--Antonym--> Recommend 
Listen <--RelatedTo--> Perceive --EtymologicallyRelatedTo--> Capable 