Corn is related to Product. Work is a type of Product. Work is etymologically related to Surgeon. Surgeon is derived from Surgery. 
Power is related to Command. Command is related to Captain. Captain is related to Operator. Engineer is a type of Operator. 
Corn <--RelatedTo--> Product <--IsA-- Work --EtymologicallyRelatedTo--> Surgeon --DerivedFrom--> Surgery 
Power <--RelatedTo--> Command <--RelatedTo--> Captain <--RelatedTo--> Operator <--IsA-- Engineer 