Teammate is a synonym of Mate. Mate is a type of Officer. Officer is related to Police. Police is part of Government. 
Known is related to Declare. Declare is related to Starting. Starting is similar to Opening. 
Teammate <--Synonym--> Mate --IsA--> Officer <--RelatedTo--> Police --PartOf--> Government 
Known <--RelatedTo--> Declare <--RelatedTo--> Starting <--SimilarTo--> Opening 