Stomaching is a verb that means tolerating or enduring something. There are several synonyms that can be used to replace stomaching, including enduring, bearing, tolerating, suffering, putting up with, standing, and accepting. Each of these synonyms has slightly different connotations and can be used in different contexts. For example, enduring or bearing may suggest a physical or emotional hardship, while tolerating or putting up with may suggest a frustrating situation or difficult person. It is important to choose the appropriate synonym based on the context and intended meaning of the sentence.