Outside is a synonym of International. International is a synonym of External. External is a type of Feature. Feature is related to Lake. 
Percentage is a type of Proportion. Percentage is related to Rate. Rate is related to Fee. 
Outside <--Synonym--> International <--Synonym--> External --IsA--> Feature <--RelatedTo--> Lake 
Proportion <--IsA-- Percentage <--RelatedTo--> Rate <--RelatedTo--> Fee 