Yes, as a matter of fact. For example, is Close to the Edge a song? If it is, and you think it's great, then it must by definition be an example of great songwriting. Is Herbie Hancock's instrumental 'Future Shock' a "song?" If it is, and Close to the Edge is also a song, then a 20-minute instrumental must also be a song, too. Which means that virtually every piece of uninterrupted music is a "song." Which means that "music-creating" and "songwriting" are the same thing. Which means that there's no point to the distinction. Unless there are limits on what can be considered a "song." But what are they? Hmmm.
See, if you had said "lyricist," then we have something specific, but you said "songwriting," so... we don't.