Set is a synonym of Appoint. Appoint is related to Title. Ms is a type of Title. Ms is etymologically related to Mrs. 
Density is related to Ice. Ice is the opposite of Steam. Steam is related to Energy. Radiation is a type of Energy. 
Set <--Synonym--> Appoint <--RelatedTo--> Title <--IsA-- Ms --EtymologicallyRelatedTo--> Mrs 
Density <--RelatedTo--> Ice <--Antonym--> Steam <--RelatedTo--> Energy <--IsA-- Radiation 