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 wpresidence-child-po.zip and activate it.
Go to Loco Translate – Manage translations and edit the en_us,po already given in child theme
Watch this video tutorial for further info
Select the site language in Settings-General
Search for the words that you wish to rename in child theme po (en_US.po)
Edit with your new words and save