Words are sorted into groups by what they do in sentences.
These groups of words are called "parts of speech."
Some important parts of speech are --
NOUNS
VERBS
ADJECTIVES
ADVERBS
PRONOUNS
PREPOSITIONS
NOUN
a word that names a person, place, thing, animal, or idea.
Example:
pilot
A "pilot" is the name for a person who flies a plane. It is a common noun. Common nouns name general persons, places, things, animals, or ideas.
Here are some examples of common nouns:
girl
city
planet
dog
Mexico
"Mexico" is the name of a place -- a country. It is a proper noun. Proper nouns name specific persons, places, things, animals, or ideas. Proper nouns start with capital letters.
Here are some examples of proper nouns:
Janet
Dallas
Mars
Rover
crayons
The word, "crayons," is the name for things people use for drawing and coloring. It is a common noun. It is also a plural noun. "Plural" means "more than one."
Here are some examples of plural nouns:
boys
rooms
cookies
cats
If a noun names just one thing, it is singular. The singular forms of the above words are --
boy
room
cookie
cat
crocodile
A "crocodile" is the name of a type of animal. It is a singular, common noun.
happiness
The word, "happiness," is the name for an idea. It can't be seen, touched, smelled, tasted, or heard, but it is an idea that can be understood, experienced, and thought about.