Reduction is the opposite of Growth. Growth is derived from Grow. Grow is related to Process. 
Happy is related to Birthday. Birthday is related to Meaning. Meaning is related to Just. Just is a synonym of Correct. 
Reduction <--Antonym--> Growth --DerivedFrom--> Grow <--RelatedTo--> Process 
Happy <--RelatedTo--> Birthday <--RelatedTo--> Meaning <--RelatedTo--> Just <--Synonym--> Correct 