Fog is related to Water. Water is related to Duck. Duck is a type of Fabric. 
Accuse is a synonym of Blame. Blame is a type of Knock. Knock is a type of Comment. 
Fog <--RelatedTo--> Water <--RelatedTo--> Duck --IsA--> Fabric 
Accuse <--Synonym--> Blame --IsA--> Knock --IsA--> Comment 