Word Properties
A few examples of what you can ask Wolfram|Alpha about:
find definitions and other properties of a word
Dictionary Lookup
find the definition of a word
find a phonetic representation for a word
find the pronunciation of a word
find lexically close words
look up synonyms of a given word
look up hypernyms (broader terms) for a given word
look up hyponyms (narrower terms) for a given word
find the etymology of a word
Word Frequency
get data on the frequency of a word
get historical word frequency data
Notable Word Uses
find places or things using a particular word
learn what an acronym stands for
decrypt a texting acronym
translate a single word into English
translate a word between languages
translate an English word into other languages