What are Voynichese words?

[Rafal]

But the meaningless hypothesist is not troubled by such questions. The writers did not need to be too precise with their 'method'.

I agree.
If I say that is is gibberish, people may oppose that it is not random.
Then I could say that it is "structured gibberish".
Then people could ask me to show the method, the algorithm used to create the text.

But probably there wasn't any precise method. The author could have some tricks but use them inconsistently. Sometimes he followed the guidelines, sometimes he improvised. For example sometimes he copied a word from prepared list of common words, sometimes copied neighbour word, sometimes altered and copied neighbour word and sometimes created a new word. And we are unable to recreate this process.

You may do a little personal experiment. Try to write down some gibberish.
Here is a sample of my gibberish for you:
botol aranan sedu alpero exim estrano bonas aquello nes padis manu limeli parde sem ater fennis

I have no idea myself why I created such words and no others   And I won't be able to recreate it unless I memorise it. You will probably have the same.