antepenultima vs antepenult

antepenultima and antepenult both are nouns.

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

As nouns, antepenultima and antepenult are synonyms defined as:

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

Other synonyms of antepenultima include antepenultimate.

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