Speaker is one who reaches out and moves an audience with power of spoken language?

That's a very good description of a speaker! Here's a slightly more nuanced way to put it:

A speaker is someone who communicates effectively and persuasively with an audience through the power of spoken language. They use their voice, body language, and words to engage, inform, entertain, or inspire their listeners.

Here's why I added these details:

* Effective and persuasive: Not all who speak are speakers. A speaker must be able to get their message across in a way that resonates with the audience.

* Engage, inform, entertain, or inspire: Speakers have different goals. Some seek to inform, others to entertain, and still others to inspire action.

* Voice, body language, and words: The power of a speaker comes from the combined effect of these elements. It's not just about what they say, but how they say it.

Ultimately, a good speaker is someone who can connect with their audience on a deeper level and leave a lasting impression.