Bag is a synonym of Thing. Thing is related to Birthday. Birthday is related to Special. Special is related to Party. 
Feed is related to Hay. Hay is related to Cow. Cow is related to Maker. 
Bag <--Synonym--> Thing <--RelatedTo--> Birthday <--RelatedTo--> Special <--RelatedTo--> Party 
Feed <--RelatedTo--> Hay <--RelatedTo--> Cow <--RelatedTo--> Maker 