There are many online resources that provide the pronunciation of Greek words, including My Languages and WorldLingo. At the My Languages site, there are Greek words with audio so people can hear the actual pronunciation. This site also has many other resources, such as a page to learn Greek.
The My Languages site provides Greek grammar and vocabulary lessons on a variety of topics, such as food, adjectives, prepositions, time, days, phrases and animals. For example, the lesson on phrases provides an English phrase, its equivalent in Greek and how to pronounce it.
The WorldLingo website offers links to a variety of online Greek dictionaries. For example, by clicking on the "Greek Dictionary" link, people can access a free dictionary that lists more than 4,000 Greek words with their pronunciations.