Ground is the opposite of Ceiling. Ceiling is related to Floor. Floor is a type of Hall. Hall is related to Length. 
Moon is related to Bright. Bright is related to Flower. Stock is a type of Flower. 
Ground <--Antonym--> Ceiling <--RelatedTo--> Floor --IsA--> Hall <--RelatedTo--> Length 
Moon <--RelatedTo--> Bright <--RelatedTo--> Flower <--IsA-- Stock 