Nest is related to Leave. Widow is a type of Leave. Wide is etymologically related to Widow. Gain is etymologically related to Wide. 
Minor is related to Musical. Musical is related to Staff. Staff is related to Department. 
Nest <--RelatedTo--> Leave <--IsA-- Widow <--EtymologicallyRelatedTo-- Wide <--EtymologicallyRelatedTo-- Gain 
Minor <--RelatedTo--> Musical <--RelatedTo--> Staff <--RelatedTo--> Department 