Observe is related to Sight. Sight is a type of Perceive. Divine is a type of Perceive. 
Weekend is part of Week. Week is etymologically related to Weak. Weak is the opposite of Beautiful. Snow can be Beautiful. 
Observe <--RelatedTo--> Sight --IsA--> Perceive <--IsA-- Divine 
Weekend --PartOf--> Week --EtymologicallyRelatedTo--> Weak <--Antonym--> Beautiful <--HasProperty-- Snow 