you are likely to find Echo in/at/on Bridge. you are likely to find Rock in/at/on Bridge. Rock is related to Rough. Rough is the opposite of Soft. 
Defendant is the opposite of Plaintiff. Plaintiff is a synonym of Actor. Actor is related to Famous. Famous is related to Condition. 
Echo --AtLocation--> Bridge <--AtLocation-- Rock <--RelatedTo--> Rough <--Antonym--> Soft 
Defendant <--Antonym--> Plaintiff <--Synonym--> Actor <--RelatedTo--> Famous <--RelatedTo--> Condition 