Christmas is related to Religion. Religion is related to Doctrine. Doctrine is a synonym of Philosophy. Ethics is a type of Philosophy. 
Nail is related to Bullet. Bullet is related to Bite. Bite is related to Mouth. Mouth is similar to Manual. 
Christmas <--RelatedTo--> Religion <--RelatedTo--> Doctrine <--Synonym--> Philosophy <--IsA-- Ethics 
Nail <--RelatedTo--> Bullet <--RelatedTo--> Bite <--RelatedTo--> Mouth <--SimilarTo--> Manual 