Transaction is related to Pay. Pay is related to Give. Give is a different concept from Keep. Keep is the opposite of Rid. 
Casual is a synonym of Everyday. Everyday is a synonym of Daily. Daily is derived from Day. 
Transaction <--RelatedTo--> Pay <--RelatedTo--> Give <--DistinctFrom--> Keep <--Antonym--> Rid 
Casual <--Synonym--> Everyday <--Synonym--> Daily --DerivedFrom--> Day 