A synonym for remediation could be

helping, curing?

mediate means to correct something, or patch up things that are wrong.

re-mediate means to do it again.

rectify, remedy, repair, amend, correct, repair,

To find a synonym for a word, you can use a thesaurus. There are several ways to access a thesaurus:

1. Online Thesaurus: Open a web browser and search for "online thesaurus." You will find several websites that offer synonyms and antonyms for words. Popular online thesaurus websites include Thesaurus.com, Merriam-Webster.com, and Dictionary.com.

2. Thesaurus feature in word processing software: If you have word processing software installed on your computer, such as Microsoft Word or Google Docs, you can utilize the built-in thesaurus feature. Simply highlight the word you want to find a synonym for and right-click. From the context menu, select the option that says "Synonyms" or "Thesaurus." A list of synonyms will appear.

Now, regarding the word "remediation," a possible synonym could be "correction," which means to fix or make right a mistake or problem. Other synonyms for "remediation" include "redress," "reparation," "amendment," or "rectification." Remember, the particular synonym you choose depends on the context in which you intend to use it.