Here is the list of grammatical words one has to know when learning a foreign language.
Nouns are words which refer to objects, concepts, places or people.
They may be definite (refer to specific instances) e.g. 'the man', 'this man', 'that man' or indefinite e.g. 'a man', men or 'some men'.
In many Western European, Slavonic and Northern Indian languages, nouns belong to genders. Nouns referring to men are usually masculine, those referring to women feminine and there may also be a neuter gender for things. Articles (the, a, an) and noun endings may change depending on the gender of a noun.
Some languages e.g. Dutch and some Scandinavian languages may also have a concept of common gender. This is where nouns which used to belong to different genders have been brought together into one gender. For example, in written Bokmål Norwegian the gender distinction is mainly between common and neuter nouns. Common nouns used to be either masculine or feminine and in spoken Bokmål you will still hear dedicated feminine endings.
Verbs are doing words e.g. go, speak, walk. They may also cover vaguer concepts e.g. be, have, become. They may change depending on person (I, you, he/she, we, you (plural), they) or by tense.
Here are some examples:
I walk to work. She is walk*ing* to work (both is and walking are verbs). We walk*ed* to work.
Walk is a regular verb. It has endings like -s, -ed and -ing and it's vowel never changes. Such verbs are sometimes called weak verbs.
I speak Norwegian. She speak*s* Swedish. We sp*o*ke Danish.
Speak is an irregular verb. It has the -s and -ing endings, but 'speaked' would be wrong. Verbs which involve vowel changes (like spoke and spoken) are sometimes called strong verbs.
Adjectives describe objects, people or states.
The ball is red. There is a green ball.
Adverbs describe verbs. In English they often end in -ly. Adverbs often tell you how people do things.
He ran quickly.