Christmas is related to Birthday. Birthday is related to Candle. Candle is a type of Examine. Exam is a form of Examine. 
Reasonable is etymologically related to Reason. Reason is related to Like. 
Christmas <--RelatedTo--> Birthday <--RelatedTo--> Candle --IsA--> Examine <--FormOf-- Exam 
Reasonable --EtymologicallyRelatedTo--> Reason <--RelatedTo--> Like 