Although these terms are often used as synonyms in the popular press, fundamentalists and evangelicals are actually two different streams within conservative Protestantism. Many fundamentalists reject evangelical "compromises" with the wider culture and evangelical cooperation with other Christian groups in social, political, and evangelistic endeavors.
At the same time, most evangelicals reject the term "fundamentalist" as derogatory and indicative of cultural separatism. That being said, the two groups are not totally mutually exclusive; certainly some fundamentalists who also think of themselves as evangelical.