добрый и хороший --these are two different words, but they are very similar in meaning . You can wish Good day and you can say about a human that he is a good (хороший) person- it's mean that he is good in general, but you can say that he is a kind ( good-добрый) person -it's mean he is not angry man . For example-- When I'm not hungry I'm a kind person --- Когда я не голоден я ДОБРЫЙ. In Russian Доброе утро, Добрый день, Добрый вечер, Доброго времени суток, Доброй ночи ---it's as a greeting but more formally, it's established expression. Добрый we use in established expressions and quality to humans and animals. Хороший we use as to everyone as to everything--- Хороший человек. Хороший день. Хороший стул. Ты сделал свою работу хорошо. And "хорошо" you can say as agree ( Купи молоко!--Хорошо. (Ок) or action approval Sorry for my English I started to study it not long ago)

I believe one would use "хорошо" for "good" in that manner, though I am not a native speaker. My Russian teacher would use "хорошо" as a compliment when we did something well. добрый I think translates more directly as "kind" or "nice". Other than these greetings, it is used to describe people ("He's a good/nice guy"). Maybe a native speaker on here can help clarify?

Russian dictionaries present adjectives in their masculine form, so you would see "добрый" listed in bold.

In my experience, "Добрый" is a common response to "Добрый день" or "Добрый вечер".

I used to greet my young children in the morning with "Добрая утка!"