Answer:
There are no underlined words here, but the nouns in the sentence are Erin, dog, and day.
Explanation:
Erin is a proper noun and dog and day are common nouns.
An epic poem is a long, serious, of someone explaining a significant event. It usually has a hero. They were used mostly in Anglo-Saxon literature because back then they never wrote anything down. Most stories were told orally. A great example would be <em>Beowulf.</em>