Lots of words - look in a dictionary. Examples would be xenophobia, xylophone, xray.
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a caterpillar
First of all you isn't a letter, it is a word. If you mean the the letter u than an engineering job that starts with that is "Urban Engineering"
Bargain.
According to wisegeek.com, the most used consonant in the English language is "t." Also, "t" is the most frequent letter that starts a word (in other words, there are more words that start with "t" than any other letter.) Heck--in this short answer alone, I've used 29 "t"s!
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