1. We learned how to use the library catalog, and we learned how to use a call number to find a book.
2. Subject headings are based on the Library of Congress Subject Headings; words just search for articles containing the words used in the search.
3. Subject headings can search for the sources that the Library of Congress put in that particular subject; they're good for projects on a single subject. Words can bring up sources that may be relevant, but do not lie within a single subject; they're good for projects that must cover material that is broader than a single subject.
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In item 2, you are correct that words just use the words in the search, but in the catalog, you are not searching for articles, you are searching for books, journal titles, media, etc. For articles, you need a database.
In item 3, you have the right idea about how these two types of searches work, but subject heading searches can work on multiple subjects. You just have to construct your searches in such as way as to elicit multiple sets of results.
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