Possessives show possession or belonging, and are formed with the addition of an apostrophe + s to the end of a noun.
Nouns name people, places, things and ideas. They’re one of the 8 main parts of speech that make up language, and they’re around us everywhere.
Things we can see, touch, feel and count are concrete nouns. Abstract nouns name nonphysical ideas, emotions, states and qualities, like empathy, justice and buddhism.
Not all heroes wear capes, and yes, ‘heroes’ is the correct plural of hero.
In English, items that are made up of parts, pieces and pairs are called plural-only nouns, also known as non-singular nouns.
Cliff plural is cliffs. Usually singular nouns that end in -f/-fe take on -ves as a plural. This is not the case with cliff/cliffs.
Collective nouns name a group, unit or collection as one whole or single entity: an army of soldiers.
Volcanoes and volcanos are both accepted plurals for volcano.
Proper nouns name specific people, places or things. Common nouns name general categories and types.
Mass nouns, also non-count nouns, are things or concepts that we cannot physically count. Think fire, sand and water, which are things we cannot count.
The plural of concerto is concerti and concertos.