we also find that nouns can change into verbs. Take the word text. Text was always a noun (from about 1369,according to the OED), but it is now very common as a verb, to text somebody. Other new words already existed but with a different meaning. For example, tweet was the noise that a bird makes, but now we use it more often (as a verb or a noun) for a message that people put on the social networking site, Twitter