Attempt is the opposite of Leave. Leave is the opposite of Do. 
Scheme is a synonym of Outline. Outline is a synonym of Abstract. Abstract is related to Feel. Feel is related to Ill. 
Attempt <--Antonym--> Leave <--Antonym--> Do 
Scheme <--Synonym--> Outline <--Synonym--> Abstract <--RelatedTo--> Feel <--RelatedTo--> Ill 