Ser vs. Sir

Ser and Sir Definitions
Ser
(in some fantasy and sci-fi novels) An address or courtesy title to any person, especially if their gender and/or form of address are unknown.
Would ser care to dine this evening?
Sir
Sir Used as an honorific before the given name or the full name of baronets and knights.
Sir
Used as a form of polite address for a man
Don't forget your hat, sir.
Sir
Used as a salutation in a letter
Dear Sir or Madam.
Sir
A man of a higher rank or position.
Sir
A respectful term of address to a man of higher rank or position, particularly:
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Sir
To a knight or other low member of the peerage.
Just be careful. He gets whingy now if you don't address him as Sir John.
Sir
To a superior military officer.
Sir, yes sir.
Sir
To a teacher.
Here's my report, sir.
Sir
A respectful term of address to an adult male (often older), especially if his name or proper title is unknown.
Excuse me, sir, do you know the way to the art museum?
Sir
To address (someone) using "sir".
Sir, yes, sir!
Don't you sir me, private! I work for a living!
Don't you sir me, private! I work for a living!
Sir
A man of social authority and dignity; a lord; a master; a gentleman; - in this sense usually spelled sire.
He was crowned lord and sire.
In the election of a sir so rare.
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Sir
A title prefixed to the Christian name of a knight or a baronet.
Sir Horace Vere, his brother, was the principal in the active part.
Sir
An English rendering of the LAtin Dominus, the academical title of a bachelor of arts; - formerly colloquially, and sometimes contemptuously, applied to the clergy.
Instead of a faithful and painful teacher, they hire a Sir John, which hath better skill in playing at tables, or in keeping of a garden, than in God's word.
Sir
A respectful title, used in addressing a man, without being prefixed to his name; - used especially in speaking to elders or superiors; sometimes, also, used in the way of emphatic formality.
Sir
Term of address for a man
Sir
A title used before the name of knight or baronet