Synonyms for Penultimate (same or very similar meaning)
WordNet sense 1 (the next to last syllable in a word):
penult, penultimaWordNet sense 2 (next to the last):
next-to-lastWordNet sense 3 (coming after all others in time or space or degree or being the only one remaining):
lastFrom the ODE community, based on WordNetadd/edit