a man eating dog
A person who uses a lot of words can be referred to as verbose or loquacious.
A person who uses sophisticated words is often called eloquent or articulate, with a strong command of language and vocabulary.
I'm not sure what I'd call that person...but I would suggest you check a dictionary. "Lenghtly" is not a word, and you've misspelled "explanation."
A person who studies the origins of words is called an etymologist. They investigate the history and development of words, tracing their roots and understanding how their meanings have changed over time.
A person who develops or invents new words is called a "neologist" or a "lexicographer." They may also be referred to as a "word inventor" or a "lexiphanic."
A "harmonicanist" is what a person who plays the harmonica is called.
A person who plays Scrabble is called a Scrabbler. (unofficially)
A drummer or percussionist plays the drums.
accordionist
harpist
a baritonist
A saxophonist.
guitarist
Guitarist
a cymbalist
A pianist.
The umpire is the person that rules on plays.