Spread is part of Publication. Contribution is a type of Publication. Contribution is related to Share. Share is a synonym of Provide. 
Afraid is etymologically related to Free. Afraid is similar to Concerned. Concerned is a synonym of Anxious. Anxious is a synonym of Troubled. 
Spread --PartOf--> Publication <--IsA-- Contribution <--RelatedTo--> Share <--Synonym--> Provide 
Free <--EtymologicallyRelatedTo-- Afraid <--SimilarTo--> Concerned <--Synonym--> Anxious <--Synonym--> Troubled 