English words with peculiar properties

Not very useful, but here it goes:

The longest word with only one vowel is strengths (9 letters), packing six consonant sounds into a single syllable. The word psychorhythms (13) is longer, but clearly uses the letter y as a vowel.

The longest common word without any of the five vowels is Rhythms.

The superlatively long word honorificabilitudinitatibus (27 letters) alternates consonants and vowels. As a country, United Arab Emirates is unsurpassed for length in its vowel/consonant alternation.

Bookkeeper has three consecutive doubled letters.

Floccinaucinihilipilification “the action of estimating as worthless” contains 9 i’s and
pneumonoultramicroscopicsilicovolcanoconiosis (a respiratory disease) requires 9 o’s.
Not words one uses everyday.

Words in which no letter is used more than once are called isograms and uncopyrightable, with fifteen letters, is the longest common isogram in English.

Boldface and feedback both contain all the letters from a to f (there are many such words, but these are the shortest at eight letters).

The longest word whose letters are in alphabetical order is the eight-letter Aegilops (a grass genus).

The smallest words with all 5 vowels: eunoia, eulogia, miaoued (the cat …), sequoia. And the shortest word with the five vowels occurring in alphabetical order is Aerious (airy), which has seven letters.

Beijing and Fiji are the only ones that have three dotted letters in a row.

And the longest word in a song is supercalifragilisticexpialidocious (Mary Poppins – who else).

Chemical nomenclature of organic compounds and especially proteins can easily beat any record, as official nomenclature rules lead to legitimate names thousands of letters long.
Chemical name for the “Tryptophan Synthetase” protein is however, the longest official word ever (1,913 letters) with the formula C1289H2051N343O375S8 And it is spelled, eh no, that’s a bit exaggerated. But you can find it here.