Largest Word in English, Know the Name of Top-10

The English language, known for its vast vocabulary and intricate word formations, is home to some incredibly long words. These lexical marvels, often used in specialized fields such as science and medicine, showcase the flexibility and adaptability of English. In this article, we will delve into the world of the largest words in the English language, exploring their origins, meanings and the fascinating linguistic landscape they represent.

Largest Word in English Language

The longest English word, pneumonoultramicropicsilicovocanoconiosis, spans 45 letters and denotes a lung disease. However, if we consider technical terms, the lengthiest word globally is a chemical name for a protein, boasting a staggering 189,819 letters. Pronouncing the entire word requires three hours!

Top-10 Largest Word in English

Pneumonoultramicropicsilicovocanoconiosis, spans 45 letters, holds the title of largest word in English, followed by Hippopotomonstrossquipedaliophobia, pseudoseudohpoparathyroidism, supercalifragilisticexpialidocious and floccinaucinihilipilification.

Here is the list of top-10 longest words in English:

Largest Words in English
S. No. Word Letters
1. Pneumonoultramicroscopicsilicovolcanoconiosis 45
2. Hippopotomonstrosesquippedaliophobia 36
3. Pseudopseudohypoparathyroidism 35
4. Supercalifragilisticexpialidocious 34
5. Floccinaucinihilipilification 29
6. Spectrophotofluorometrically 28
7. Antidisestablishmentarianism 28
8. Psychoneuroendocrinological 27
9. Pneumoencephalographically 26
10. Otorhinolaryngological 22

Longest Word in English – Pneumonoultramicroscopicsilicovolcanoconiosis

No. of letters: 45 letters

A recently coined and highly specialized term in English, comprising 45 letters, describes a lung condition resulting from inhaling silica dust. Although Oxford Dictionary labels it as factitious, the more commonly used and easier-to-recall abbreviation for both the term and the illness is “silicosis.”

Second Largest Word in English – Hippopotomonstrosesquippedaliophobia

This 36-letter term, ironically, denotes the fear of long words and is renowned as one of the longest words in the English language. Strangely, it is not commonly included in dictionaries.

Third Largest Word in English – Pseudopseudohypoparathyroidism

This 35-letter term describes a condition resembling hereditary pseudopseudohypoparathyroidism, but without elevated levels of calcium and phosphorous in the blood.

Fourth Largest Word in English – Supercalifragilisticexpialidocious

This 34-letter term, made famous by the 1964 Disney musical Mary Poppins, is commonly used to express uncertainty or a lack of specific words. Found in dictionaries within the context of the movie and musical, it serves as an expression when words may fail.

Fifth Largest World in English – Floccinaucinihilipilification

The 29-letter term “floccinaucinihilipilification” is employed as a noun to express the act of considering something as trivial or unimportant.


This 29-letter term functions as an adverb and pertains to the measurement of light emitted, typically utilizing a spectrophotofluorometer.


This 28-letter term represents a political philosophy that opposes both state and church. It is widely acknowledged as one of the longest non-coined, non-technical words and reflects an ideology advocating the separation of government and religious institutions.


This 27-letter term asserts itself as one of the longest words in English. It serves as an adjective describing the psychological exploration of the connection between human behavior and hormones.


This 26-letter technical term describes outdated medical procedures involving the removal of spinal fluid and the introduction of air to enhance visibility of the structural components of the brain.


This 22-letter term, serving as an adjective, describes matters related to otorhinolaryngology, which is the study and treatment of conditions affecting the ear, nose and throat.

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