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Just two words carry Z second and U third, and they are the same word in two forms.
AZURE names the deep blue of a clear sky and has been an English colour word for centuries. AZURY is its adjective, meaning somewhat azure, and it is rare enough that most readers have never met it.
It began as the Persian lazhuward, the name of the stone we call lapis lazuli. Arabic took it as al lazaward, and in the passage into European languages the initial L was mistaken for an article and dropped.
So the A at the front of AZURE is a fragment of a word that no longer means anything. Both entries on this page carry that accident in their spelling.
A opens both and R fills the fourth box in both. Only the final letter differs, which makes this the narrowest two word page on the site.
Confirming anything before the last box leaves both options live. The final letter is the entire puzzle.
AZURE, without hesitation. It is a familiar colour word while AZURY appears almost nowhere outside word lists.
The blue of a cloudless sky, lighter and clearer than navy. In heraldry it is the standard term for blue.
It is the source of it. Ground lapis gave painters ultramarine, the most expensive pigment of the medieval period.
Speakers heard al lazaward as containing the Arabic article al, then European languages reanalysed the remaining l as part of their own article. The letter was lost twice over.
Neither. Zero of the two place the same letter twice.