The nouns are: whales, dolphins and aquarium. Nouns are names of a person, animal, place, event, etc. It could be proper or common noun. Common nouns are names of general items and you find them everywhere you go. These words are not usually capitalized, except if it is the starting word in a sentence. Proper nouns on the other hand are more specific names and they are capitalized. When clauses substitute the noun’s role, then they are called ‘noun clauses’. Therefore, noun clauses can be direct object or subject. To find them, one must look for the verb first and try to ask questions with ‘who’ or ‘what’.