Words are ( in some ways my definition is like tylerunb14) a series of learned sounds to express a meaning. Depending on which language used a word may behave in a different fashion than in another language. For our purpose I am speaking about English, which is derived from many different languages.
We write the words using a unique set of symbols which is a far development from cave paintings which told stories with pictures and some symbols.
Words as a vocal expression are used to connect with others, convey a meaning and define a person place or thing. Some words are descriptive while others are just a name for something. Depending on its juxtaposition with other words, a word or group of symbols can take on an entirely different meaning.
Vocalization of sets of sounds and tone of the sounds add meaning to the words.
They represent our perception or perceived reality which is all anyone really has.
Remember reality is subjective.
Words can be magical though I don't think they are magic themselves. What makes them magic is when a specific word is chosen and it precisely expresses the person place or thing, the listener gets a rounder more full idea or picture of what is taking place. That is the lightbulb that goes off in someones head. A completely understood expression. This is the bond that people enjoy in the exchange of conversation and reading and writing!
Words developed over so many years even during prehistoric times.
If you looked at a letter it is a hieroglyphic and each is vocalized when combined with other letters. This is a highly complex and developed method of communication. Here are my words on it!