DLP in Office Excel and Word?

This sounds like https://www.microsoft.com/en-us/cloud-platform/azure-information-protection, which has an Automated data classification option that can https://docs.microsoft.com/en-us/information-protection/deploy-use/configure-policy-classification patterns like social security numbers and https://docs.microsoft.com/en-us/information-protection/deploy-use/configure-policy-protection can be applied with Azure RMS or a Do not forward option for Outlook email messages. 

This does come at an extra https://www.microsoft.com/en-us/cloud-platform/azure-information-protection-features.