Sonorant-only phonology

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What are sonorants?

Sonorants are one of two primary superclasses of sounds produced in speech.

The other is Obstruents — plosives (p, b, t, d, k, g, etc), fricatives (f, v, θ, ð, s, z, ʃ, ʒ, etc), taps & flaps (), and others.

Sonorants include:

Class	common examples	IPA
V — Vowels	i, e, a, o, u, ʌ	i, ɪ, y, e, ə, ɜ, ɛ, æ, a, ɑ, ɒ, ʌ, ɔ, o, ʊ, ɵ, u
N — Nasals	m, n, ñ, ŋ	m, n, ɲ, ɳ, ŋ
Y — Semi-vowels — liquids, approximants, glides	w, y, l, r	w, β̞, ʋ, ð̞, l, ɫ, ɹ, j, ʎ, ɰ

As you can see, there are a lot of available phones to choose from! And this is not an exhaustive list. So by no means would it be a challenging language to create.

It would most likely feature a lot of diphthongs, and probably some pronunciation­—grammar morphology by which certain sounds are metastasised in order to produce word mutations, due to the smaller range of available consonants.

Syllable structures:

Monophthongs

	-	-N	-Y	-YN
V	a	an	ay	ayn
N-	na	nan	nay	nayn
Y-	ya	yan	yay	yayn
NY-	nya	nyan	nyay	nyayn

Diphthongs

	-	-N	-Y	-YN
VV	oa	oan	oay	oayn
N-	noa	noan	noay	noayn
Y-	yoa	yoan	yoay	yoayn
NY-	nyoa	nyoan	nyoay	nyoayn

Available phones

Vowels

i ɪ y e ə ɜ ɛ æ a ɑ ɒ ʌ ɔ o ʊ ɵ u

Nasals

m n ɲ ɳ ŋ ɴ

n͡m ɳ͡m ŋ͡m

Liquids

l ɫ ɭ ʎ ʟ ʟ̠

Approximants

w β̞ ʋ ð̞ ɹ ɹ̠ ɻ j ɥ ɰ