Loyalty is related to Friend. Friend is etymologically related to Free. Free is related to Republic. Republic is related to American. 
Poem can be used for Romance. Romance is related to Book. 
Loyalty <--RelatedTo--> Friend --EtymologicallyRelatedTo--> Free <--RelatedTo--> Republic <--RelatedTo--> American 
Poem --UsedFor--> Romance <--RelatedTo--> Book 