There are many synonyms to use for the word "scares." Some of the most popular are "frightens," "terrifies," "daunts," "intimidates," and "horrifies." Each of these words conveys a sense of fear or intense emotions in response to a situation or stimulus. Other synonyms that may be less commonly used but still effective include "petrifies," "appalls," "dismays," "disquiets," and "unsettles." Some of these words suggest a deeper level of distress or unease than simply being scared. Overall, having a variety of synonyms to choose from can help to add depth and nuance to one's writing or speaking about scary or intimidating experiences.