Is there a difference between a trademark and a URL?

While your domain name and your trademark may be the same word/phrase, they are separate things.

A domain name is an Internet address, such as www.milleripl.com. It is the name that individuals type into a browser to access a website. The rights to domain names are regulated by domain name registrars, such as GoDaddy. You can obtain a domain name by purchasing it from the registrar.

A domain name can be registrable as a trademark if the name serves to identify the source of a good or a service, such as the use of a domain name on marketing or promotional materials for services or packaging for a product.

Vise versa, you can secure the domain names that correspond with trademarks. However, as opposed to trademarks which can cover the use of the same or similar words. Similar domain names can pose problems for people looking for your website and they can dilute your trademark. To avoid this issue, you may want to acquire multiple domains names with different spellings or endings such as .com, .net, and .org, etc. Also, you may consider domain names with variations in spelling, spacing, hyphenation, abbreviation, gripe names, common typographical errors, and so forth.