Door is related to Square. Square is related to Brick. Brick is a type of Insect. Insect is related to Animal. 
Web is related to House. Housing is a form of House. 
Door <--RelatedTo--> Square <--RelatedTo--> Brick --IsA--> Insect <--RelatedTo--> Animal 
Web <--RelatedTo--> House <--FormOf-- Housing 