Bug is related to Fly. Fly is related to Need. Need is a synonym of Will. Will is related to Refuse. 
Nature is related to Calm. Calm is a synonym of Steady. Steady is the opposite of Slip. Slip is related to Movement. 
Bug <--RelatedTo--> Fly <--RelatedTo--> Need <--Synonym--> Will <--RelatedTo--> Refuse 
Nature <--RelatedTo--> Calm <--Synonym--> Steady <--Antonym--> Slip <--RelatedTo--> Movement 