antepenult vs antepenultima

antepenult and antepenultima both are nouns.

Word	Noun	Adjective	Verb	Adverb
antepenult	Yes	No	No	No
antepenultima	Yes	No	No	No

As nouns, antepenult and antepenultima are synonyms defined as:

antepenult and antepenultima: the 3rd syllable of a word counting back from the end

Other synonyms of antepenult include antepenultimate.

antepenult (noun)	antepenultima (noun)
the 3rd syllable of a word counting back from the end	the 3rd syllable of a word counting back from the end