Freshman is derived from Fresh. Fresh is related to Fish. 
Officer is related to President. President is related to Legislator. Senator is a type of Legislator. Senator is a type of Person. 
Freshman --DerivedFrom--> Fresh <--RelatedTo--> Fish 
Officer <--RelatedTo--> President <--RelatedTo--> Legislator <--IsA-- Senator --IsA--> Person 