Amuaco

General information
Amoco is a language spoken by a small community in Paraguay. Its relationship to other languages is unknown, though it is assumed to be an isolate. Its ancestral structure appears have some similarities to Guarani, and it may additionally have been influenced by some other nearby language families. It was first described by Spanish missionaries, and its modern writing system is a subset of the Latin alphabet with grapheme values based on Spanish.

Consonants
Amoco has 39 consonants, notable for extensive coarticulation. It historically had a simpler system with 17 consonants, but is now generally analyzed with a more complex consonant system due to mergers and a transfer of certain vowel qualities onto consonants in the form of coarticulation. In the development from Old Amoco, vowel frontness and rounding would be transferred onto the consonant, with consonants becoming palatalized before /e i/ and labialized before /o u/. Coronals and velars, as well as /h/, merged to become true palatals before front vowels. Palatalized uvular stops later became velar. /h/ became [ɸʷ] before a back round vowel and /gʷ/ became [w]. Ejectives tend to be only weakly so, often pronounced tenuis in unstressed syllables. Voiced stops may become fricatives intervocalically. Every consonant in Amoco also has a nasalized variant. For most consonants, this takes the form of a prenasalization, but the voiced stops become simple nasal stops. Fricatives and tenuis stops become voiced in addition to prenasalization.

Vowels
Amoco phonetically exhibits a five vowel system /a e i o u/. It historically had a twelve-vowel system identical to that of modern Guarani, but vowel frontness, rounding, and nasalization became transferred onto consonants, and phonetic [ɨ] was usually deleted. It is sometimes represented as having two vowels /a ɨ/ due to morphemic patterns of consonants with a particular following vowel grade carrying meaning. In this model, [e i o u] are analyzed as realizations of underlying /a ɨ/ after particular consonant coarticulations. [i u] are realizations of /ɨ/ after a palatal and labial consonant, respectively, and [e o] are realizations of /a/ after a palatal and labial consonant. In stressed non-word-final syllables, /e/ and /o/ may be diphthongized to [jɛ] and [wɔ], respectively. Amoco also has six diphthongs, corresponding to any combination of a high vowel followed by an offglide /i u/

Phonotactics
Basic Amoco syllables follow the pattern (N)CV(G), where C is a consonant, V is a vowel, (N) represents phonemic nasalization, and G is an offglide /i u/ that may only come after high vowels. Consonant clusters may not occur in Amoco except where original /ɨ/ has been elided.

Tone
Amoco exhibits word tone in polysyllabic words. One syllable in each word carries an accent, either high or low. The accented syllable tends to be in the last three syllables. In words with high tone accent, pitch starts low, gradually rises, peaks on the accented syllable, and drops off. In words with a low tone accent, pitch starts mid, drops heavily to the accented syllable, and remains low for the rest of the rod. Low tone cannot occur word-initially.

Writing System
The writing system of Amoco is based on Spanish orthography. It does not reflect word tone or the distinction between aspirated and ejective stops.

a [a]

b [b]

c [kʰ],[kʼ] (used before )

ch [cʰ],[cʼ]

d [d]

e [e]

f [ɸ]

g [g] (used before )

hi [j]

hu [w]

i [i]

j [h]

l [l],[ʎ]

m [m]

n [n]

ñ [ɲ]

ng [ŋ]

o [o]

p [pʰ],[pʼ]

q [qʰ],[qʼ]

qu [kʰ],[kʼ] (used before )

s [s]

sh [ç]

t [tʼ]

ts [tˢ]

u [u]

y [ɟ]