Capitalism is not a "mode of production". Capitalism is a means of disseminating production that does occur on a voluntary basis.

Labor is work, work is "activity involving mental or physical effort done in order to achieve a purpose or result."

Way to make a distinction without a difference.

"It is true that under the wages system, the individual is not free to choose permanent unemployment. But no other imaginable social system could grant him a right to unlimited leisure; that man cannot avoid submitting to the disutility of labor (work) is not an outgrowth of any social institution. It is an inescapable natural condition of human life and conduct"
Ludwig Von Mises