Compound (linguistics)
Agglutinative languages tend to create very long words with derivational morphemes. Compounds may or may not require the use of derivational morphemes also.
The longest compounds in the world may be found in the Finnic and Germanic languages. In German, extremely 
extendable compound words can be found in the language of chemical compounds, where, in the cases of biochemistry and polymers, they can be practically unlimited in length, mostly because the German rule suggests combining all noun adjuncts with the noun as the very last stem. German examples include (color television set), (radio remote control), and the often quoted jocular word (originally only two Fs, Danube steamboat shipping company captain['s] hat), which can of course be made even longer and even more absurd, e.g. "Donaudampfschifffahrtsgesellschaftskapitänsmützenreinigungsausschreibungsverordnungsdiskussionsanfang" ("beginning of the discussion of a regulation on tendering of Danube steamboat shipping company captain hats") etc. According to several editions of the Guinness Book of World Records, the longest published German has 79 letters and is " Donaudampfschiffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft "("Association for Subordinate Officials of the Main Electric[ity] Maintenance Building of the Danube Steam Shipping"), but there is no evidence that this association ever actually existed. The word is so absurd that it was obviously invented as a joke, which is emphasized by the illogical use of the plural of "electricity".
List of placeholder names by language
German also sports a variety of placeholders; some, as in English, contain the element "Dings", "Dingens" (also "Dingenskirchen"), "Dingsda", "Dingsbums", cognate with English "thing". Also, "Kram", "Krimskrams", "Krempel" suggests a random heap of small items, e.g. an unsorted drawful of memorabilia or souvenirs. "Apparillo" (from "Apparat") may be used for any kind of machinery or technical equipment. In a slightly higher register, "Gerät" represents a miscellaneous artifact or utensil, or, in casual German, may also refer to an item of remarkable size. The use of the word "Teil" (part) is a relatively recent placeholder in German that has gained great popularity since the late 1980s. Initially a very generic term, it has acquired a specific meaning in certain contexts. "Zeug" or "Zeugs" (compare "Dings", can be loosely translated as 'stuff') usually refers to either a heap of random items that is a nuisance to the speaker, or an uncountable substance or material, often a drug. Finally, "Sache", as a placeholder, loosely corresponding to Latin "res", describes an event or a condition. A generic term used especially when the speaker cannot think of the exact name or number, also used in enumerations analogously to "et cetera", is the colloquial "schlag-mich-tot" or "schieß-mich-tot" (literally "strike/shoot me dead", to indicate that the speaker's memory fails him/her).