Crop is related to Farm. you are likely to find Duck in/at/on Farm. Duck is related to Yellow. 
Boast is related to Claim. Proclaim is etymologically related to Claim. Proclaim is a type of Entitle. Entitle is a synonym of Enable. 
Crop <--RelatedTo--> Farm <--AtLocation-- Duck <--RelatedTo--> Yellow 
Boast <--RelatedTo--> Claim <--EtymologicallyRelatedTo-- Proclaim --IsA--> Entitle <--Synonym--> Enable 