Slave is related to Like. Like is related to Depend. Depend is related to Independent. Independent is related to Functional. 
Trade is related to Equal. Equal is related to One. One is the opposite of Crowd. Crowd is the opposite of Alone. 
Slave <--RelatedTo--> Like <--RelatedTo--> Depend <--RelatedTo--> Independent <--RelatedTo--> Functional 
Trade <--RelatedTo--> Equal <--RelatedTo--> One <--Antonym--> Crowd <--Antonym--> Alone 