Why won't my s6 forget craigslist emails?

[Enkaybc]

Oh man please help! Everytime I send a text my "learned words" brings up craigslist reply email addresses that I have replied to over years and years from my Gmail account. I have deleted these emails (or so I thought) from my synced contact list but they keep showing up in my text bar! Has anyone else has this issue? There are hundreds of different craigslist emails coming up and deleting them from "learned words" by holding down the email and saying OK is time consuming and impossible to get them all it seems. TIA!