The word quieten is rarely used in the US. The noun is quiet, or silence. However, the word quieten is often used in contexts like: Did it quieten his nerves? So the noun could be relaxation, soothing or perhaps peace or stillness.
Never the less, the room did quieten down to catch the groovy lyrics.
Nouns that have no plural form are called mass nouns, uncountable nouns, or non-count nouns.
The verb of quiet is quieten. For example "to quieten something or someone".
Nouns. as an example: Within a sentence there may be a single noun or a number of nouns.
quiet
Proper Nouns: Used to define the specific name of a noun. Common Nouns: The general form of nouns.
Nouns is already Plural. If you are asking about nouns in general, add S or ES, depending.
The plural form of "simpático" in Spanish is "simpáticos" for masculine nouns and "simpáticas" for feminine nouns.
Examples of nouns that are plural in form but singular in meaning:pajamaspoliticsnewsglassesbinocularsscissorspantsshortstrouserstongstweezersmathematicsspeciesclothescongratulationsmolassesmumpsphysicseconomicscivicsaerobaticsgymnasticsmeasles
Some nouns that do not have a singular form are:Aggregate nouns, words representing an indefinite number of parts. Examples:accommodationsbarracksclothescommunicationsgoodsspeciesNouns that are a short form for a 'a pair of'. Examples:glassesscissorstweezerspajamaspantsshorts
quieten
The plural form of "viejo" in Spanish is "viejos" when referring to masculine nouns, and "viejas" when referring to feminine nouns.