Pop is related to Rock. Rack is etymologically related to Rock. Rack is a synonym of Neck. 
Beach is related to Warm. Warm is related to Friendly. Friendly is related to Help. Secretary can be used for Help. 
Pop <--RelatedTo--> Rock <--EtymologicallyRelatedTo-- Rack <--Synonym--> Neck 
Beach <--RelatedTo--> Warm <--RelatedTo--> Friendly <--RelatedTo--> Help <--UsedFor-- Secretary 