Reference is a type of Meaning. Reference is related to Name. Name is related to Handle. Handle is related to Toilet. 
Mount is a synonym of Mushroom. Mushroom is a synonym of Swell. Belly is a type of Swell. Belly is related to Surface. 
Meaning <--IsA-- Reference <--RelatedTo--> Name <--RelatedTo--> Handle <--RelatedTo--> Toilet 
Mount <--Synonym--> Mushroom <--Synonym--> Swell <--IsA-- Belly <--RelatedTo--> Surface 