We have decided to go for fixed bid this time.
it should have admin module to administer users and word.Words can be text or vedio.
it's vocab/word list application for students.
i don't want to tell each and every small detail since it's being implemented so many times .it will have a registration feature customization of words feature..and many many more.
for your reference you can visit.
http://www.dictionary.com
http://www.mywordlist.com
http://www.grevocabulary.org/
http://www.soundkeepers.com/GMAT/
and many more you can search them on Google.
English Dictionary Database Experience required.