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Only six words hold Z second and O third, and OZONE is the one in general use.
OZONE is known to everyone, and nothing else on this page comes near it. The other entries are chemistry terms built on the same Greek root for life that gives us zoology.
AZOLE names a class of ring compounds containing nitrogen, and AZOTE is an old name for nitrogen itself. AZOTH was the alchemists' name for mercury.
AZOIC means without life and describes rocks holding no fossils. So the page runs from modern organic chemistry back through eighteenth century naming to alchemy.
A takes five of the six and O takes the remaining one. The first box is effectively a question of whether the word is OZONE or not.
E closes three of the six, more than any other letter, from OZONE, AZOLE and AZOTE.
With six words on the page and one of them doing all the work, this is a pattern where a single guess usually settles everything.
From the Greek for smell, because of its sharp odour. The same root has nothing to do with the azo words beside it.
A ring compound containing nitrogen. Many antifungal drugs belong to the group and carry the name.
Without life, used of geological periods or rocks that contain no trace of living things.
The alchemists' name for mercury, and also for a supposed universal remedy. It is a word out of the history of science rather than science.
Zero of the six do, so every box carries a different letter throughout.