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I have picked up a couple of these domains in the past and always built similar sites that still match the description in dmoz with my content.
Good luck.
So (to coin a fictitious example) if I had a site lemurs.com about furry lemurs and their diets, and I bought an expired domain animalyumyumfood.com that has a description "Guide to the dietary needs of furry lemurs" and is in the /animals/lemurs/feeding sub-category, how can I persuade Dmoz to change the title of the site from "Animal Yum Yum Foods" to "Lemurs.com"?
...use things like, "welcome to New Title", "we at New Title" or a clear header.
Then use the update url form to submit the change. Wait 6 weeks. If nothing happens, drop a note to the editor (if there isn't one listed, write to the first named editor as you move up the cat hierarchy).
Then wait...there are no guarantees. And even then, if the name change seems somewhat gratuitous, you might find an editor reluctant to change it.