Net is etymologically related to Neat. Neat is related to Being. Being is related to Profit. Profit is the opposite of Lost. 
Ally is the opposite of Enemy. Enemy is related to Bad. 
Net --EtymologicallyRelatedTo--> Neat <--RelatedTo--> Being <--RelatedTo--> Profit <--Antonym--> Lost 
Ally <--Antonym--> Enemy <--RelatedTo--> Bad 