Kill is related to Very. Very is related to Simple. Simple is related to Door. 
Fall is related to Stumble. Stumble is a synonym of Slip. Slip is related to Short. Short is the opposite of Wide. 
Kill <--RelatedTo--> Very <--RelatedTo--> Simple <--RelatedTo--> Door 
Fall <--RelatedTo--> Stumble <--Synonym--> Slip <--RelatedTo--> Short <--Antonym--> Wide 