Detective is derived from Detect. Detective is related to Profession. Pilot is a type of Profession. 
English is related to Let. Let is related to Like. Like is related to Doll. Doll is related to Elephant. 
Detect <--DerivedFrom-- Detective <--RelatedTo--> Profession <--IsA-- Pilot 
English <--RelatedTo--> Let <--RelatedTo--> Like <--RelatedTo--> Doll <--RelatedTo--> Elephant 