Visible is a synonym of Appear. Appear is related to Sudden. Sudden is related to Flash. 
Banana is a type of Dessert. Banana is related to Bunch. Bunch is a synonym of Gang. Gang is related to Group. 
Visible <--Synonym--> Appear <--RelatedTo--> Sudden <--RelatedTo--> Flash 
Dessert <--IsA-- Banana <--RelatedTo--> Bunch <--Synonym--> Gang <--RelatedTo--> Group 