Labour for me is human productive effort towards achieving set target.To answer the question, labour may be wealth, in the sense that when others labour while you fold your harms and watch from where will the wealth come from? Wealth creation cannot be separated from human effort both mental and physical.
Sorry to say labor doesn't really defines wealth but skills and qualifications is mostly subjected to wealth creation. I have seen those who labour and got employed yet their salaries didn't create wealth for them rather it's only create a semi payment channels to keep you earnings while you sort out your emergence need at the moment. So, to me wealth comes entirely from your creativity such as discovery or invention of things can make you easily wealthy than labour, although labor can be termed as the general classifications, because as one is putting efforts to produce a specific results is also known to be labor. Therefore, effort, skills and creativity or invention can be termed to be a process of labouring.