Invisible is related to Energy. Energy is related to Electrical. Electrical is related to Spark. Spark is a synonym of Ghost. 
Implementation is a synonym of Execution. Execution is a synonym of Murder. Murder is a type of Sin. Sin is related to Wave. 
Invisible <--RelatedTo--> Energy <--RelatedTo--> Electrical <--RelatedTo--> Spark <--Synonym--> Ghost 
Implementation <--Synonym--> Execution <--Synonym--> Murder --IsA--> Sin <--RelatedTo--> Wave 