It cannot be a language - in reference to Koen's latest video

[Dana Scott]

Koen did a fantastic video about a month ago where he showed that Voynich really only has 8 functional letters. I've racked my brains trying to come up with any language even close to that and the closest I can think of is if Japanese dropped the diacritics and the syllabary structure of the written language. They would still end up with 14 characters! 

Vowels:
a 
i
u 
e
o
Consonants:
k
s
t
n
h
m
y
r
w

This is setting aside the fact that there are still five more consonants in the Japanese language, g z d b p, which are currently marked by diactritics. I'm not sure if a Japanese speaker would be able to comfortable read a text without diacritics. You could also, perhaps, merge n and m into one one sound as the ん (n) can make both [n] and [m] sounds depending on what sounds follow it. 

So, bending and breaking every concievable rule, Japanese can, at best, get down to 13 characters, and in doing so making the reading process quite arduous. And thats 60% more characters than the Voynich manuscript has! 

It just can't be a language. It cannot...

The Hawaiian alphabet uses 12 letters:

Vowels:
a
e
i
o
u

Consonants:
h 
k
l
m
n
p
w