The level of intensity and the purpose escalates from shouting, to yelling, and lastly screaming.
Shout and yell are very similar, but if one shouts in anger, we often call that “yelling” rather than “shouting. “Additionally, in everyday conversation, the word shout is more common, and both words are less intense than screaming.
When you shout, you’re just raising your voice without any particular emotional aim.
For example, you may shout at someone that wouldn’t hear you otherwise.

Example:
“It’s too noisy in here!” she shouted.
(END OF THE EXTRACT).
why we need articles(a, an and the)
Articles in English are not there for decoration, they tell us extra information about a noun.
The indefinite article a/an tells us that something is singular, but not a particular thing which we have spoken about before. In many cases it is synonymous with “any”. For example: “I don’t want a cat” - means I don’t want any cat.
The definite article the, tells us that we know something about a particular thing/things, that the thing we are talking about is already something the speaker and the listener both know about. For example: “I don’t want the cat” - means I don’t want a particular cat, and that you and I both know which particular cat we are talking about. And of course “the” can be used in the plural, but a/an can’t be.
When a word is in the plural, but we still want to use the indefinite a/an, we omit the article. For examples “I don’t like cats”, which means I don’t like any cats - or cats in general. If we were to say “I don’t like the cats”, it means I don’t like those particular cats.
Interestingly, if someone said to you in English “I don’t like cat” - we might assume they don’t like to eat cat!!
If articles were forbidden, we wouldn’t know which things people were talking about - and it would lead to confusion. We’d need to employ extra adjectives like “any” or “particular” to get across the same idea. Of course English is not the only language which employs articles. Most of the Germanic languages do, and since English is a Germanic language it’s no surprise that we use them too. Also most of the Romance languages use them as well, French, Spanish, Portuguese and Italian.