Theater is related to Debut. Debut is related to Beginning. Beginning is a synonym of Spark. 
Bucket is etymologically related to Buck. Buck is a synonym of Single. Single is related to Cell. Cell is related to Basis. 
Theater <--RelatedTo--> Debut <--RelatedTo--> Beginning <--Synonym--> Spark 
Bucket --EtymologicallyRelatedTo--> Buck <--Synonym--> Single <--RelatedTo--> Cell <--RelatedTo--> Basis 