Nouns made up of more than one word are called compound nouns, e.g.
Son-in-law
Attourney-General
Prime Minister
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An example of words that are always plural in form that can me one or more than one are binary nouns.Binary nouns are words for things made up of two parts to make the whole. Binary nouns are a shortened form of 'a pair of...'Examples of binary nouns are:glasses, a pair of glasses, two pairs of glassespantsshortsslackspajamasscissorstweezerstongspliers, a pair of pliers, two pairs of pliers
Two forms of nouns are:singular, a word for one person, place, or thing.plural, a word for two or more people, places, or things.
Two kinds of nouns are common or proper, singular or plural.
No, the plural noun 'days' is an abstract noun, a word for two or more units of 24 hours. All nouns for time are words for concepts.
The two numbers of nouns are singular and plural.