monsuta word is still there:
http://en.tokipona.org/wiki/monsuta does indeed exist. I can't tell if it's absence on the list it is an oversight.
http://en.tokipona.org/wiki/noka redirects to anpa. Given that there is a redirect, I guess we have evidence that the disappearance of noka was intentional.
I don't think noka can be replaced with anpa. In anycase, I would have guessed noka would be closer to luka.
mi tawa anpa. --> I travel by means of my lower body(?!) vs I'm going down (town).