There are other tags that can be used to format text, a limited sample of which are given below. Note again that these describe what the content between the opening closing tags is; what it looks like is immaterial, in this context.

specifies that a word is defined inline (to be useful, the opening <dfn> tag requires a title attribute with its value set to the definition of the term. You’ll see this title definition appear when you move your mouse over the word in a browser.)
specifies that the word is an abbreviation; same requirements and features as <dfn> above
defines a short quotation
defines superscript ordinal text, such as for a footnote.
defines subscript text

Finally, note that all of these tags must be nested inside another that provides a context for the block of text as a whole: typically <p>, although there are many other possibilities.