Graduation is related to Ceremony. Ceremony is related to Ritual. 
Royal is related to Stuff. Stuff is related to Tobacco. Tobacco is a type of Herb. Herb is a synonym of Weed. 
Graduation <--RelatedTo--> Ceremony <--RelatedTo--> Ritual 
Royal <--RelatedTo--> Stuff <--RelatedTo--> Tobacco --IsA--> Herb <--Synonym--> Weed 