Start is a type of Play. Play is related to Ball. Ball is etymologically related to Balloon. Balloon is related to Bubble. 
Enter is related to Marry. Marry is related to Love. Love is related to Deep. Deep is related to Shallow. 
Start --IsA--> Play <--RelatedTo--> Ball --EtymologicallyRelatedTo--> Balloon <--RelatedTo--> Bubble 
Enter <--RelatedTo--> Marry <--RelatedTo--> Love <--RelatedTo--> Deep <--RelatedTo--> Shallow 