称颂 is a formal, literary verb meaning to praise or extol someone's virtues, achievements, or contributions. Unlike everyday words like 表扬 (to praise in daily life) or 赞美 (to praise, often for beauty or divinity), 称颂 appears in more elevated contexts — speeches, essays, historical narratives, or official commendations. You would use it for someone who is widely admired for their character or deeds, not for casual compliments.