Dear tsuwm: I found a site which had "nulutative" as part of a list of words to learn. The other words were not particulary obscure.

Words To Learn
... gelid; insouciant; lagniappe; lambience; lissome; moue; nacreous; nubile; nulutative;
peculation; puissant; recombinant; remanent; salacious; scarify; sessile; sidereal; ...
http://www.gci-net.com/users/j/johnw/WordsToLearn.html