Diminish is a synonym of Lower. Lower is related to Class. Class is related to Education. Education is related to Abuse. 
Pick is related to Choose. Choose is related to Determine. Determine is a synonym of Define. Define is a type of Characterize. 
Diminish <--Synonym--> Lower <--RelatedTo--> Class <--RelatedTo--> Education <--RelatedTo--> Abuse 
Pick <--RelatedTo--> Choose <--RelatedTo--> Determine <--Synonym--> Define --IsA--> Characterize 