In order to rename theme words, you can use Loco Translate plugin.
Please see the steps that need to be followed:
1.Install Loco Translate plugin
2. Install wprentals-child-po.zip and activate it.
3. Go to Loco Translate – Manage translations and edit the en_us,po already given in child theme
The translation may need to be updated following theme updates. Please see here how – https://help.wprentals.org/article/how-to-update-the-po-translation-after-a-theme-update/