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William Friedman (1891-1969) is remembered as one of the world's foremost cryptologists and became involved with the Voynich in the early 1920s when he corresponded with its namesake.
During his work, he developed the theory that the Voynich manuscript represented a text in a synthetic language (using or describing inflection).
John Tiltman was a British intelligence specialist, working in association with William Friedman.
Friedman asked Tiltman for his opinion on the Voynich MS text, and sent him copies of the final quire.
He concluded that the text is far too complicated to be the result of a simple cipher and be the results of applying a standard cipher to some plain text.
He spent some time discussing the option of a synthetic or 'universal' language as proposed by Friedman.
The FBI also tried during the Cold War, apparently thinking it may have been Communist propaganda.
The US National Securities Agency collaborated with German code-breaker Erich Hüttenhain based on the earlier work of British code-breaker John Tiltman because they had a notion that it might contain communist propaganda.

Ultimately, a consensus emerged: that the manuscript was either impossible to solve or else written in gibberish, as an elaborate practical joke.

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Although the purpose and meaning of the manuscript had eluded scholars, including Alan Turing, for over a century, it took only two weeks to identify the language and writing system...
it was compiled by Dominican nuns as a source of reference for Maria of Castile, Queen of Aragon...
'The language used was ubiquitous in the Mediterranean during the Medieval period, but it was seldom written in official or important documents...

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DeusxMac
[arstechnica.com]

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DeusxMac
[arstechnica.com]

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Lew Zealand
Wrong Ars Technica article maybe? This one is current:

[arstechnica.com]