Download web pages having ID in URL

I am using one web site which is basically has search field with suggestions as you write word you want informations about, some sort of dictionary. So I would like to have this website downloaded so I could use it offline. Problem is that words are only accessible when being searched, e.g. ther is no list of words or something so I could save it and then write some kind of script to iterate over them to get word's URL. When I search manually for word I get URL which is in form of http://xyz.../index.php?show=search_by_id&id=f19gWRI%3D
So I think it wouldnt be good solution to try to generate ID one by one and check will it return something except for start page.

So I was woundering is there any way for me to download this site.