Scream is a synonym of Yell. Yell is related to Like. Like is related to Print. Print is related to Develop. 
Exist is a type of Software. Steam is a type of Software. Steam is related to Shower. 
Scream <--Synonym--> Yell <--RelatedTo--> Like <--RelatedTo--> Print <--RelatedTo--> Develop 
Exist --IsA--> Software <--IsA-- Steam <--RelatedTo--> Shower 