Bright is a synonym of Light. Light is related to Cotton. Cotton is a type of Like. Like is related to Wood. 
Mystery is the opposite of Known. Known is a different concept from Surprise. Surprise is related to Obvious. Obvious is the opposite of Subtle. 
Bright <--Synonym--> Light <--RelatedTo--> Cotton --IsA--> Like <--RelatedTo--> Wood 
Mystery <--Antonym--> Known <--DistinctFrom--> Surprise <--RelatedTo--> Obvious <--Antonym--> Subtle 