Better English Language Use

Hi guys, it is about two words in English that seem like each other and every word has its special use, I will start:
Good/Well:
Good is an adjective which qualifies a noun, while Well is an adverb which qualifies a verb; example: I've slept so well. Or: the night was so good.

come on mates, is it difficult? I will add you an other one:
Always/still:
Always is used for an action which is repeated: oh no, not that story again,he always tells the same stupid joke. While Still is used for an action which never stops: And he is still speaking,I can't stand it anymore, I'm going to fall asleep.

Great idea dear Angel ! i love such games!

By vs Until

1. By denotes the last moment in which something needs to be done. Until denotes the total amount of time one has to
accomplish something.

2. By is more like an ultimatum, while until is akin to having grace time to get something done.

3.Until is deployed to imply a usage that defines an action, or activity, in a period prior to the time period that will follow the word. By is used to denote an occurrence at, or prior, to a given time.

4. By is the goalpost that has to be reached. Until gives you a sense of the time and opportunity you have to accomplish something.

Examples:
1. She won't be back until 5 o'clock. - she'll be back at 5.
2. She won't be back by 5 o'clock. - she won't be back before 5.