First of all, words are communication symbols composed of strokes. Stroke, communication and symbol are three main points.
There are many communication symbols, especially in today's highly developed advertising. Trademarks, packaging, pictures, sounds and so on are all symbols of communication. Only communication symbols composed of strokes can be words. Of course, written communication mainly spans time, space or both.
Secondly, words must be ideographic records or express information. In other words, the content must be conveyed, which can be expressive or memorable. Each character must correspond to a concept. What doesn't correspond to the concept is not words, but graffiti composed of strokes.
Third: the object of writing is people, not others. There are other symbols, which are not as good as the corresponding language symbols of the computer language used by the computer. In the future, when we wander in the sea of stars, will the words used by aliens be words? The answer should be yes. People should not be confined to us.