Posted by Lisa on Tuesday, December 2, 2008 at 7:23pm.
Yes. Summer is a noun.
Direct objects are always nouns or pronouns.
I think you're confused about the 8 parts of speech (noun, pronoun, adjective, adverb, verb, preposition, conjunction, interjection) and parts of a sentence (subject, verb, direct object, etc.)
http://www.uottawa.ca/academic/arts/writcent/hypergrammar/grammar.html
You can get explanations about the parts of speech (noun, pronoun, etc.) and the parts of sentences (subject, verb, etc.) by using the list at the left.
http://www.chompchomp.com/menu.htm
And here ... in the Terms section.
http://members.cox.net/lenco1/grammarpractice/
And here ...
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