Dictate vs Instruct (Which context or vibe it used for?)

I recently found the word "dictate". As always, I dived into the dictionary and took a look for definition. Following is what I found.

Dictate
to give orders, or tell someone exactly what they must do, with total authority

(from Cambridge Dictionary)

At the moment I saw this definition, the word "instruct" directly came to my mind and I was a bit confused. So, I searched for definition of "instruct".

Dictionary told me

Instruct
to order or tell someone to do something, especially in a formal way

Two words seems interchangeable for me! So I googled "dictate vs instruct" sort of things. However, I could not able to find any useful information: usually means they are used in very different situation.

What are the difference between them and what situations and mood or vibe they are typically used respectively?

Solution 1:

Use dictate for authoritative commands, emphasis on authority. Use instruct for educational descriptions of processes, emphasis on making expectations clear.

Dictate has two general uses: either A) to issue decrees in an authoritarian manner, or B) to speak words that are intended to be transcribed by another person.

A dictator is (MW.com):

1a : a person granted absolute emergency power especially, history : one appointed by the senate (see senate sense 1b) of ancient Rome

b : one holding complete autocratic control : a person with unlimited governmental power

c : one ruling in an absolute ... and often oppressive way fascist dictators

2 : one who says or reads something for a person to transcribe or for a machine to record : one that dictates...

Instruct carries more of a sense of teaching or guiding someone about how they are expected to perform a task.

An instructor is (Mw.com) "one that instructs : teacher."