Garden is the opposite of Parking. Parking is related to Permit. Permit is the opposite of Forbid. 
Grateful is similar to Glad. Glad is related to Content. Universe is a type of Content. 
Garden <--Antonym--> Parking <--RelatedTo--> Permit <--Antonym--> Forbid 
Grateful <--SimilarTo--> Glad <--RelatedTo--> Content <--IsA-- Universe 