Scan is related to Review. Review is a type of Analyze. Compare is a type of Analyze. Compare is a different concept from Contrast. 
Outdoor is a synonym of Outside. Outside is related to Sky. Sky is related to Blue. Blue is a different concept from Red. 
Scan <--RelatedTo--> Review --IsA--> Analyze <--IsA-- Compare <--DistinctFrom--> Contrast 
Outdoor <--Synonym--> Outside <--RelatedTo--> Sky <--RelatedTo--> Blue <--DistinctFrom--> Red 