Break is the opposite of Keep. Keep is a synonym of Carry. Carry is related to Burden. 
Sake is a type of Benefit. Benefit is the opposite of Injure. Injure is etymologically related to Injury. Injury is related to Bone. 
Break <--Antonym--> Keep <--Synonym--> Carry <--RelatedTo--> Burden 
Sake --IsA--> Benefit <--Antonym--> Injure --EtymologicallyRelatedTo--> Injury <--RelatedTo--> Bone 