You are familiar with such parts of speech as nouns, pronouns, adjectives, verbs.
A noun names somebody or something - a man, a dog, an ostrich, a pen.
A pronoun is a word that we can use instead of (במקום) a noun - I, he, she, it, we, you, they.
An adjective describes (מתאר) somebody or something - big, interesting, yellow.
A verb says what we do - play, read, have.
Try some games to check yourself:
http://www.englishclub.com/esl-quizzes/grammar-1-parts-of-speech.htm
Adjectives:
http://www.englishclub.com/esl-quizzes/grammar-1-adjective-order.htm