"Millimeter" is an English word that has a double 'i' in it.
The following words have three consecutive sets of double letters:bookkeeperbookkeepersbookkeeping
No, "worried" is not a double consonant. It is a word that contains two consecutive consonants ("r" and "r"), but it does not represent a double consonant combination in English.
There are actually 3 words that I'm aware of that have the double "u" in them. They are: Vacuum Continuum Residuum
A double consonant refers to a consonant repeated twice in a row in a word, such as "ll" in the word "yellow" or "ss" in the word "dress." This repetition helps indicate a short vowel sound in English pronunciation.
The word "mission" has a double "s" because it follows the spelling pattern of many words derived from Latin that end in "-sion." This spelling rule helps maintain consistency in the English language.
A word with a double Y: sayyid.
Bookkeeper. Although Subbookkeeper has four.
The following words have three consecutive sets of double letters:bookkeeperbookkeepersbookkeeping
double
It is as in a 'vacuum'
Double, fold, turn.
Mississippi
committee
bookkeeper
Double or twice
double dutch.
3. Actually, it is the only English word with 3 sets of double letters in a row.