Sign is related to Attention. Concentration is a type of Attention. Concentration is similar to Major. 
Captain is a synonym of Supervisor. Supervisor is a type of Superior. Superior is related to Command. Command is a type of Authority. 
Sign <--RelatedTo--> Attention <--IsA-- Concentration <--SimilarTo--> Major 
Captain <--Synonym--> Supervisor --IsA--> Superior <--RelatedTo--> Command --IsA--> Authority 