There's a setting in the Form Builder (specifically in the More area of the Field Settings) called PDF & Web Label. This setting allows a different field label to be shown on the submission than the text displayed in the form.
In the Advanced Form Builder, you will find this setting under the More section of your Field Settings:
The value included in this field setting will display on the Submissions page in the portal and on your Submission PDF (Standard or Designer), but not in the form.
For example, you could have a field in your form with a label that directs the user to input their name, but the PDF & Web Label could denote what type of data is being displayed in the submission:
In this case, the user will see the field label 'Input Your Name Here' when completing a submission in the form, but the resulting submission will display the field label 'Employee Name' on the website and resulting Standard or Designer PDF.