Emotion is related to Blue. Blue is a different concept from Purple. 
Union is related to Marry. Marry is related to Religious. Religious is the opposite of Casual. Casual is a synonym of Random. 
Emotion <--RelatedTo--> Blue <--DistinctFrom--> Purple 
Union <--RelatedTo--> Marry <--RelatedTo--> Religious <--Antonym--> Casual <--Synonym--> Random 