"Feat strength" refers to a person's ability to accomplish impressive and difficult tasks. Synonyms for this term include prowess, mastery, ability, aptitude, proficiency, expertise, and skill. These words all suggest a high level of competency and achievement, often in a specific field or activity. Prowess connotes someone who excels in physical or intellectual activities, while mastery suggests someone who has complete control over a skill or art form. Ability and aptitude denote natural or learned skills, while proficiency, expertise, and skill emphasize a person's competence and extensive knowledge in a particular area. Using these synonyms can help elevate the description of someone's impressive accomplishments to a more nuanced and descriptive level.