to give a lecture; to make a speech
演 · 14 strokes
Phonosemantic compound. 氵 represents the meaning and 寅 represents the sound. Based on the original meaning "flow out". The meaning later shifted to "spread", "develop", and "perform".
讲 · 6 strokes
Phonosemantic compound. 讠 represents the meaning and 井 represents the sound. Simplified form of 講.