Authority is a synonym of Agency. Agency is related to Organization. Organization is related to Executive. 
Write is a synonym of Compose. Instrument is a type of Compose. Instrument is related to Telescope. 
Authority <--Synonym--> Agency <--RelatedTo--> Organization <--RelatedTo--> Executive 
Write <--Synonym--> Compose <--IsA-- Instrument <--RelatedTo--> Telescope 