Funny...most people probably consider themselves "lyricists". But, the definition of the word means "someone who writes song lyrics". Therefore, anyone who isn't a biter is a lyricist.

As for increasing vocab, you have to read bro. You have to not only read, but expose yourself to as much as possible. That could be in the form of print, visual media, music, and dialogue. Being able to use obscure references and vocab in your writing is made possible by increasing your knowledge of things/facts/people/places/events.

So, I would suggest reading as much as possible.

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Youtube Video for my song "CARRY ON"