I've always wanted to know this and I finally realized the answer.
Characters include all the symbols, numbers and letters. Including spaces is up to you. Example:
Symbols~, . / < > ? :" ;'{} [] !@#$%^&*()_+-
Numbers 0123456789
Letters: abcdefghijklmnopqrstuvwxyz
Count each and every symbol, number and letter.
Hey dude!
with spaces=9 characters without=8 characters
Words, I think you know what it is right?
Hey dude!
words= 2
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Slang words are words that are not in the dictionary.
The difference between the words argue and persuade are . Argue is a form of relevating to what you are going to rgue abojnklf;uyikofjjiy
No difference, both words refer to a royal domain
Main characters are the "heroes" or those characters who drive the narrative or action of the story. The "subordinate characters" give the main characters a bit more definition or dimension by interacting with them positively or negatively. They include anyone who is not a main character.
There is no difference between unconventional and non-conventional. You can use both either of these words to reference something that is not considered the norm.