Objective: Find the longest word, which can be made from concatenation smaller words.

* Words (and smaller words inside) must be findable at dictionary.com
* Punctuation (for example ') does not count as part of the smaller word
* No numbers
* Must be done in English
* Must contain at least 3 smaller words

30 letters:


made from the 3 words:

Pseudo, Pseudo , hypoparathyroidism

Answerer: TroyAndAbed

  • $\begingroup$ what about overlap? or adding an s to make the plural form? $\endgroup$
    – JLee
    Jul 7, 2015 at 19:10
  • $\begingroup$ To make it more challenging/interesting, I suggest you disallow prefixes and suffixes... $\endgroup$ Jul 7, 2015 at 19:26
  • $\begingroup$ Plurals are fine. Prefixes/Suffixes are fine. Overlaps are not. $\endgroup$
    – warspyking
    Jul 7, 2015 at 20:20
  • 1
    $\begingroup$ why only english? in german there would be words like: "Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz" a word made of "Rindfleisch", "etikettierung", "überwachung", "aufgaben", "übertragung" and "gesetz". It's the name of a Law in "Mecklenburg-Vorpommern". $\endgroup$
    – Sebu
    Jul 8, 2015 at 13:15
  • 4
    $\begingroup$ I’m voting to close this question because open-ended puzzles are off-topic $\endgroup$
    – bobble
    May 3, 2021 at 22:08

4 Answers 4


30 letters:


made from the 3 words:

Pseudo, Pseudo , hypoparathyroidism

Also with 28 letters a non-medical word:


Made with :

Anti, disestablishment, arianism

  • $\begingroup$ Is "arianism" a word? $\endgroup$ Jul 7, 2015 at 19:26
  • $\begingroup$ @rand - No, it's conjoined suffixes. If we're going to do that, why not make it antidisestablishmentarianistic for a nice round 30 $\endgroup$
    – Deacon
    Jul 7, 2015 at 19:38
  • $\begingroup$ @randal'thor Yes it's a word : dictionary.reference.com/browse/arianism?s=t $\endgroup$ Jul 7, 2015 at 19:39
  • $\begingroup$ @user12365 arianistic exist but not antidisestablishmentarianistic $\endgroup$ Jul 7, 2015 at 19:40
  • $\begingroup$ You aren't using it in that way. You're using it as -arian (being of the belief of something) -ism (acting on something). $\endgroup$
    – Deacon
    Jul 7, 2015 at 19:46

18 letters:

counterprogramming: counter, program, ming
unfortunately countercountermeasures (22 letters!) wasn't found in dictionary.com :(

Some words off the top of my head:

13 letters:


12 letters:

forevermore, nonetheless


Not sure if this is valid, but the word is


45 letters!

Which can be divided in:

Pneumo no ultra microscopic si lic o volcano coniosis

Also, this can be divided as:

Pneumo no ultra microscopic sil ico volcano coniosis

And, in order to really abuse the spirit of the question, this can be divided even in this way:

P n e u m o n o u l t r a m i c r o s c o p i c o s i l i c o v u l c a n o c o n i o s i s

Source: https://en.wikipedia.org/wiki/Pneumonoultramicroscopicsilicovolcanoconiosis

  • $\begingroup$ Abreviations and acronyms aren't "words" $\endgroup$
    – warspyking
    Jul 10, 2015 at 1:53

I got



pneum ono ultra microscopic silico volcano coniosis

May seem a little sketchy but it’s still valid. (Btw if your sketchy about Ono then https://www.thefreedictionary.com/Ono)


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