What is/are the noun(s) in the following sentence?: The lion's roar can be heard for miles.
roar and miles.
It is the roar that is heard so roar is the subject of the sentence.
Lion's is an adjective describing where the roar came from. Lion is a noun but in this case it is used as a passive, adjective.
for miles is the object of the sentence. The prepositional phrase contains the noun miles.