May -ea be a variation of this suffix? It seems as if -ea can replace the last vowel of a noun, mostly if the last vowel is -a, but also -o. At first I was just confused by number suffixes like
Tolto + -a -> Toltea,
Otso + -a -> Otsea,
Canta + -a -> Cantea,
but there are also many other adjectives.
ala-óma-a -> alómea
ú-pahta-a -> úpahtea
nem-e-sta-a -> nemestea
ú-fanwa-a -> úfanwea
la-ista-a -> laistea
farasta-a -> farastea
So, might -ea be a suffix too?
At least we can say: -a + -a -> -ea. What do you think?
This suffix is frequently used to create the adjective form of a noun, especially in the form -ëa for nouns ending in -ë. This function dates back to CE. ✶-ā.