Web is a type of Weave. Weave is related to Cotton. 
Threshold is a synonym of Doorway. Doorway is a synonym of Door. Door is a type of Room. Ceiling is part of Room. 
Web --IsA--> Weave <--RelatedTo--> Cotton 
Threshold <--Synonym--> Doorway <--Synonym--> Door --IsA--> Room <--PartOf-- Ceiling 