Big is a different concept from Small. Small is related to Crowd. Crowd is a synonym of Cluster. 
Tribal is related to Chief. Chief is related to Tribe. Tribe is related to Human. 
Big <--DistinctFrom--> Small <--RelatedTo--> Crowd <--Synonym--> Cluster 
Tribal <--RelatedTo--> Chief <--RelatedTo--> Tribe <--RelatedTo--> Human 