Slight is the opposite of Value. Value is related to Rich. Rich is the opposite of Plain. 
Phase is a type of Appearance. Form is a type of Appearance. Form is related to Claim. 
Slight <--Antonym--> Value <--RelatedTo--> Rich <--Antonym--> Plain 
Phase --IsA--> Appearance <--IsA-- Form <--RelatedTo--> Claim 