Collapse is related to Ruin. Ruin is the opposite of Preserve. Preserve is related to Sugar. Sugar is related to Juice. 
Enroll is a synonym of Recruit. Recruit is related to Hire. 
Collapse <--RelatedTo--> Ruin <--Antonym--> Preserve <--RelatedTo--> Sugar <--RelatedTo--> Juice 
Enroll <--Synonym--> Recruit <--RelatedTo--> Hire 