While not the longest chemical name in English, the name for tryptophan synthease (a protein enzyme) has 1909 letters. This is considered the longest "published" English word, but is dwarfed by the 189,819-letter name for the largest known protein, titin.
(see the related link)
I do believe that "this" is a four letter word in the English language which is used as a preposition.
No word in the english language
that is not possible for the English language
the
in
English does.
There is no such word in the English language.
Exactly like you pronounce the word "you" in English.
mother
None in the English language.
Polish
In the Spanish language, the word "letra" is a feminine noun which translates into the English language to mean letter, handwriting, lettering or lyrics.