Two elements whose common names differ by a single letter?

Xenon and Neon-- by name.


Neon - the atomic number is 10 and the chemical symbol is Ne. The name derives from the Greek neos for "new". It was discovered from its bright red spectral lines by the Scottish chemist William Ramsay and the English chemist Morris William Travers in 1898 from a liquified air sample.





Xenon - the atomic number is 54 and the chemical symbol is Xe. The name derives from the Greek xenon for "the stranger". It was discovered by the Scottish chemist William Ramsay and the English chemist Morris William Travers in 1898 in a liquified air sample.

Two elements whose common names differ by a single letter?
You're asking a question which is extremely difficult to answer. To answer this you would have to know the common names of every single element. I would answer but It's extremely challenging, if not possible at all.
Reply:Erbium and terbium, both found with the other lanthanides.
Reply:neon and xenon?