Obstacle is related to Course. Course is part of Meal. 
Sexy is derived from Sex. Sexy is similar to Intimate. Intimate is a synonym of Thick. Thick is related to Wide. 
Obstacle <--RelatedTo--> Course --PartOf--> Meal 
Sex <--DerivedFrom-- Sexy <--SimilarTo--> Intimate <--Synonym--> Thick <--RelatedTo--> Wide 