Radio is related to Wave. Wave is related to Hand. Hand is related to Slap. 
Restriction is a synonym of Limitation. Limitation is a type of Regulation. Regulation is similar to Standard. Standard is a type of Rule. 
Radio <--RelatedTo--> Wave <--RelatedTo--> Hand <--RelatedTo--> Slap 
Restriction <--Synonym--> Limitation --IsA--> Regulation <--SimilarTo--> Standard --IsA--> Rule 