Occur is a synonym of Pass. Pass is related to Drive. Drive is related to House. 
Hostile is similar to Aggressive. Aggressive is related to War. War is related to Bullet. Bullet is related to Bill. 
Occur <--Synonym--> Pass <--RelatedTo--> Drive <--RelatedTo--> House 
Hostile <--SimilarTo--> Aggressive <--RelatedTo--> War <--RelatedTo--> Bullet <--RelatedTo--> Bill 