As a Host, you decide how you want Groups to be titled in your Mighty Network. You can choose from a list of available options, or set up a custom name.
To rename Groups, go to Network Settings > Premium Features > Groups > Manage > Rename Groups.
From here, you can select one of the options in the dropdown menu, or you can add a custom name for your Groups.
One note. When you choose Add a Custom Name, you'll be prompted for both a singular and plural version, so that sentences are easily readable to your members.
That's it! That's how easy it is to Rename Groups in your Mighty Network.