On grammatical class:

nomo'o
discursive utterance ordinal: zeroth section/chapter ordinal; foreword.
pamai
discursive: first utterance ordinal.
pamo'o
discursive utterance ordinal: first section/chapter ordinal.
remai
discursive: second utterance ordinal.
romai
discursive utterance ordinal: finally; last utterance ordinal.
za'umai
discursive: further utterance ordinal