How to use words: plague, infection, contagious, epidemic?

[Florawong]

i know there must be some diffenreces among those words. what are they then? and thank you for your help. or can you recommend some website or dictionary where i can learn these things, eg. the use of synonyms

[Yankee]

Hi Flora

Here is a very useful website:
www.onelook.com
Just enter the word you're looking for and the site will find it for you in lots of different dictionaries.

[Florawong]

thanks a lot, really