Lawmaker is a synonym of Legislator. Senator is a type of Legislator. Senator is a type of Worker. Worker is related to Servant. 
Brush is related to Hair. Eyebrow is a type of Hair. 
Lawmaker <--Synonym--> Legislator <--IsA-- Senator --IsA--> Worker <--RelatedTo--> Servant 
Brush <--RelatedTo--> Hair <--IsA-- Eyebrow 