The word "shielder" is commonly used to describe someone who protects or defends something or someone. However, if you're writing an article or story and want to mix up your vocabulary, there are several synonyms you could use. For instance, you might refer to a shielder as a defender, guardian, protector, or champion. Other words that could be used include custodian, watcher, champion, or keeper. Each of these synonyms conveys a slightly different nuance, so consider which one best fits your intended meaning before making your choice. With a little creativity, you can easily swap out "shielder" for a fresh and dynamic synonym that better suits your writing style.