Then there are “cranberries”: clear compounds, but where one of the two components is no longer a recognized word.
(In case you were wondering, this was originally “craneberry,” probably from the supposedly bird-like shape of the flower, IIRC).
I’ve always enjoyed “yellowwood”: y-e-double l-o-double double-u- double-o-d.
Willowwood would be even more so, but that appears to be two words.
Apologies if these have been mentioned:
Passion
Passage
Passing (etc.)
Session
Mummers
Dummy
Rattle
Banner
Banns (archaic)
Barrel
Baffle
Dudding (etc.)
Piffle
Missal
Kerfuffle
Rigging
Tiffin
Toffee
There are lots of words in a legal context with a “ee” suffix, like “lessee” (a double double), garnishee, and so on.
I can only think of these “zz” words
Grizzled
Sozzled
Sizzled
All words with a short vowel.
As previously, apos for repetitions.
fizz
buzz
Derivatives like fizzle, buzzing
~Max
Pizza has a long vowel.
There’s also chukker, one of the periods of which a polo match consists.
pizzazz - two double z’s.
But I’m sure he’s been vaxxed.
I like mine with ppepperronnii.
mmm
Equus (genus classification that includes horses, burros, donkeys, etc)
Chukker (an innings, as it were, in a polo match) Ooops, Sternvogel beat me to that one!
Vacuum
Or accountants in the Navy assigned to warships that go underwater.
I was thinking also a bird but alas, only one K.
Guzzled.
I can’t believe this but a search revealed no puzzle(d).
Also, fuzzy.
And muzzy.
I expect @puzzlegal will have something to say about that.
There’s lots of words with double-Z. It’s not one of the rarer double letters. J, Q, X and Y are the really rare ones. There’s several others that are somewhat rare, but Z isn’t one of them.
On thinking it over some more, I think that the double-x thing might only be for neologisms: Long-established English words ending in x don’t double the x in any of their inflected verb forms, like “boxer/boxed”, “mixer/mixed”, or “fixer/fixed”. Even for one as recent as “fax”, it’s “faxed”, not “faxxed”.
And yet, “doxxed” still somehow seems more natural than “doxed”.
This is correct. Before the two recent coinages (doxx* and vaxx*), the only XX examples were variant spellings from 500+ years ago and could only be found in the OED.
This excludes various commercial names like ExxonMobile and TJ Maxx.
Long ago I read that when Exxon was arriving on the scene as a multi-national corporation it wanted a name that didn’t mean “rat turd” in Swahili or something. Someone knew the only language that commonly has a double-X was Maltese, giving Jimmie Foxx as an example. A Maltese dictionary was consulted, no entry for exxon was found so that was selected.