Entitle is a synonym of Title. Title is related to Painter. Painter is related to Brush. Brush is related to Similar. 
Subtle is the opposite of Obvious. Obvious is a synonym of Appear. 
Entitle <--Synonym--> Title <--RelatedTo--> Painter <--RelatedTo--> Brush <--RelatedTo--> Similar 
Subtle <--Antonym--> Obvious <--Synonym--> Appear 