List is a type of Database. Calendar is a type of List. Calendar is related to Decade. Decade is a different concept from Century. 
Fit is a type of Adapt. Fit is related to Physical. Physical is related to Matter. Matter is related to Gray. 
Database <--IsA-- List <--IsA-- Calendar <--RelatedTo--> Decade <--DistinctFrom--> Century 
Adapt <--IsA-- Fit <--RelatedTo--> Physical <--RelatedTo--> Matter <--RelatedTo--> Gray 