Possibility is a type of Concept. Possibility is related to Could. Could is related to Able. Disability is derived from Able. 
Straw is related to Laugh. Laugh is the opposite of Cry. 
Concept <--IsA-- Possibility <--RelatedTo--> Could <--RelatedTo--> Able <--DerivedFrom-- Disability 
Straw <--RelatedTo--> Laugh <--Antonym--> Cry 