Effect is related to Cloud. Cloud is a type of Change. Change is etymologically related to Exchange. 
Various is derived from Variety. Vary is etymologically related to Various. Drift is a type of Vary. Drift is a type of Float. 
Effect <--RelatedTo--> Cloud --IsA--> Change --EtymologicallyRelatedTo--> Exchange 
Variety <--DerivedFrom-- Various <--EtymologicallyRelatedTo-- Vary <--IsA-- Drift --IsA--> Float 