In OpenQuran you will find all these things you need if you know a little about Regular Expressions
If you are looking for verses ending with a specifiedletter (e.g ending with letter م) do as follow:

In the Search box paste this: م$
select option (in whole quran) and (Regular expressions)
than you will find all verses that end with M letter

with this search (م |م$) you will get all words that ends with M
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To know more about regular expressions just google and you will find a lot of explanation and Tutorials

Thanks
Salam