Suspection is a term used to describe a feeling of doubt or mistrust towards someone or something. However, there are several other synonyms that can be used interchangeably to convey the same meaning. One such synonym is suspicion, which also signifies doubt or mistrust. Another word that can be used is distrust, which implies a lack of confidence or belief in someone or something. Furthermore, the term skepticism can be employed to express a questioning or doubting attitude. Lastly, the word apprehension can be used to describe a feeling of unease or worry about a particular situation or person. Ultimately, these synonyms serve as alternatives to suspection to accurately convey a sense of doubt or mistrust.