Conviction is a strong and powerful word that represents a strong belief or opinion. There are several synonyms available for the word "conviction" that could be used in different contexts. A few popular synonyms for conviction include certainty, assurance, confidence, faith, and trust. While all of these words denote a strong belief, each of them emphasizes a different aspect of conviction. For instance, if you want to emphasize the idea of certainty, you can use the word "certainty" instead of conviction. Similarly, if you want to convey a sense of trust or faith, you can use the words "trust" or "faith" instead of conviction. Ultimately, the use of synonyms can add depth and richness to your language.