Authorize is a type of Permit. Authorize is a synonym of Pass. Pass is a synonym of Enact. Enact is a type of Act. 
Unusual is derived from Usual. Usual is a synonym of Plain. Plain is a synonym of Apparent. 
Permit <--IsA-- Authorize <--Synonym--> Pass <--Synonym--> Enact --IsA--> Act 
Unusual --DerivedFrom--> Usual <--Synonym--> Plain <--Synonym--> Apparent 