Ease is a synonym of Reduce. Reduce is a type of Become. Become is related to Stretch. Stretch is a synonym of Reach. 
Mouth is related to Speech. Speech is related to Discussion. Discussion is a synonym of Discourse. 
Ease <--Synonym--> Reduce --IsA--> Become <--RelatedTo--> Stretch <--Synonym--> Reach 
Mouth <--RelatedTo--> Speech <--RelatedTo--> Discussion <--Synonym--> Discourse 