Signal is a synonym of Sign. Sign is related to Language. Language is related to Culture. Culture is related to Sample. 
Design is related to Interior. Interior is a synonym of National. National is similar to Federal. Federal is a synonym of Union. 
Signal <--Synonym--> Sign <--RelatedTo--> Language <--RelatedTo--> Culture <--RelatedTo--> Sample 
Design <--RelatedTo--> Interior <--Synonym--> National <--SimilarTo--> Federal <--Synonym--> Union 