noun
A naming word for a person, place, animal or thing: firefighter, park, moose, drum.
singular
Just one: one cat.
plural
More than one: three cats.
pronoun
A word that takes the place of a noun. I is a pronoun you use for yourself.
verb
An action word: run, eat, jump, sing. Is and was are verbs too.
past, present, future
Past already happened (walked). Present is happening now (walk). Future will happen later (will walk).