If you're planning a visit to Japan or are a student of the language, you can probably use a good English-Japanese dictionary. Here's one from Declan Software that looks VERY complete.
"
Declan's Japanese Dictionary uses Jim Breen's EDICT Japanese-English dictionary database. The version of the database used by this program includes around 20,000 words each with it's kana/romaji pronunciation. Pronunciations can be viewed as kana or romaji (English script). And, searches of pronunciations can also be made using romaji."
I don't know about you, but 20,000 words sounds like a lot to me. Heck, I doubt that I even know 20,000 words in English! This dictionary is also priced much more reasonably than others I've seen; you can get the full version for only $15.95 from the
Handango site. There's also a free demo to try.