Language not only reflects your world view, but it can influence it as well. Write a paper on how language determines specific ways of thinking. For example, you can examine the dual nature of words in a research paper. Consider how, in English, the words "cool," "hot," "warm" and "cold" all represent temperatures, but the same words also reference adjectives relating to personality type.
Many Americans believe that English, as the national language, is the native language of most speakers. Within the nation's borders, however, lie tribes of people speaking a variety of different tongues, the Native Americans. Consider writing a research paper on a native language of a tribal group near your school. These languages are accessible for study, and you will find they differ dramatically from English. Review how elements such as storytelling and dialogue differ because of the structure of the language. Alternatively, you can compare English to the native language, looking at mistakes that early translators made because of the translator's lack of understanding of the tongue.
Many Milton scholars have studied the differences in speech between God and Satan in "Paradise Lost." According to Cordelia Zuckerman and Thomas H. Luxon in "'Things Invisible to Mortal Sight': Milton's God," God's language is flat when compared to Satan's vibrant tone. In this same vein, consider comparing and contrasting the speech of different characters in one of your favorite novels. Try to discern where the author intentionally used voice to accentuate a character's qualities. Conversely, seek to understand where the author's human limitations caused him to make errors, for example, an author having characters in historical novels using words that had not yet appeared.
Sign language allows deaf and mute people to communicate with others. But sign language, because it uses a different tool (the visible body instead of the mouth, throat and lungs), has certain limitations. It also contains certain elements that spoken language cannot, such as simultaneity (it's not restricted to linear expression).
Write a research paper that studies sign language or another "limited" language, exploring the strengths and weaknesses and paying attention to how these strengths and weaknesses affect the speakers.