Lock is related to Need. Need is related to Strong. Strong is related to Muscle. 
Plaintiff is the opposite of Suspect. Suspect is a synonym of Accuse. Accuse is a synonym of Blame. 
Lock <--RelatedTo--> Need <--RelatedTo--> Strong <--RelatedTo--> Muscle 
Plaintiff <--Antonym--> Suspect <--Synonym--> Accuse <--Synonym--> Blame 