Am I able to pair my Yahoo email with iCloud email?

No.

But you can read all your email in the Mail app.

Add an email account to your iPhone, iPad, or iPod touch - Apple Support

DaisyGrammy Said:

"Sync Am I able to pair my yahoo email with iCloud email so they sync with each other? Phone ES and MacBook Air"

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Use the Mail App:

If you want to access them both, then you need to use the Mail app. And to add Yahoo to it, you would likely need an App Password to log in.

1. Go Here: Generate and manage third-party app passwords - Yahoo Mail Help
2. Click: Generate an app password
3. Proceed from there as necessary.

Not sure what a "Phone ES" is, however, to answer your question, there is no pairing of emails between Yahoo email and iCloud email. Perhaps, if you can provide some detail and explanation on what you are attempting to accomplish then we may be able to help.

Axel F.