Extend is a type of Straighten. Extend is a synonym of Stretch. Stretch is related to Gentle. Gentleman is derived from Gentle. 
Fortune is a synonym of Fate. Fate is a synonym of Necessity. Necessity is related to Need. 
Straighten <--IsA-- Extend <--Synonym--> Stretch <--RelatedTo--> Gentle <--DerivedFrom-- Gentleman 
Fortune <--Synonym--> Fate <--Synonym--> Necessity <--RelatedTo--> Need 