Another form of the word, Egotism, is really interchangeable, though in ordinary language it is often used specially (and similarly egoism, as in George Meredith's Egoist) to describe the habit of magnifying one's self and one's achievements, or regarding all things from a selfish point of view.
egoist הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד