How can I change some button labels in the dashboard/admin area?

I am using WP as a repository of store locations and then using an RSS feed of the posts to display them on another site. It seems to be working well, after a lot of customizing of the rss file. Now, I would like the references to “Posts” in the dashboard to be changed to read “Stores”. I looked at the language section but wasn’t sure how to know which entries correspond to which labels, etc. Is there a relatively easy way to determine where to look (or if this is even the right place to look) for this? I wonder if there is a kind of plugin that lets you make targeted, individual changes to the admin panel language.

Thanks!