I'm guessing this is a pretty straightforward question. Examples would be
helpful too, thank you!
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particle-の
Can someone explain the difference between の as a pronoun vs. の as a particle?
Please consider my answer to [This
question](https://japanese.stackexchange.com/questions/9379/%E3%81%AE-cannot-
be-used-as-a-pronoun-meaning-one-for-highly-abstract-objects-but-wh).

Both the question and my answer (and other answers as well) will redirect you
to very interesting content and useful grammar aspects regarding your
question.
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の as a particle has the very simple function of noun modification. You might
find some comparisons between の and the English 's or "of", however these can
be a bit confusing once you start running into less directly translatable
uses.

For example:

  * 私の車 - My car
  * 昨日の宿題 - Yesterday's homework
  * アメリカの出身 - To be from America
  * なんのため(？) - For what purpose(?)

It can also act similarly to the particle が in some sentences:

  * 人気{ひとけ}のないところ
  * 人気{にんき}のあるもの - Popular item (can put anything here)

の as a pronoun, on the other hand, is very simple in its most basic uses,
being the basic equivalent to the English "one." The question that Andry links
to addresses the nuances, but most of the time you'll be fine associating it
with "one" in English, or something similar to a possessive pronoun like
"mine." For example:

  * 赤いの欲しい - I want a red one 
  * 暖かいの飲みたい - I want to drink a hot one
  * 私のは小さい車だよ - My car is the small one

There are some grammatical rules to it, like not ending the sentence with the
pronoun の. Grammar dictionaries are great for the nuances.
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2012-11-16T04:47:27.387
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Well, "A dictionary of basic Japanese grammar" has a special paragraph about
it. It gives:

> 私はトムの(ペン)がほしい。 - I want Tom's (pen).

In this example トムの is the omitted form of トムのペン. Therefore it's just a
particle and not a pronoun.

On the other hand, a noun can't be added after の used as a pronoun. i.e.

> 私は黒いのが欲しい - I want a black one.

In this case, の is not an omitted form.

Saying:

> 私は黒いのペンが欲しい - I want a black pen (Grammatically wrong!)

Would be grammatically incorrect (The right way would be 私は黒いペンが欲しい).
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To be precise, の is a particle that can fulfill different roles (mainly:
attribution, concomitancy, substitution). So の as a "pronoun" is just の
particle substitutive use and not a pronoun.

So from your question, the main difference will be the role in the sentence.

**Atribution** ([連体]{れんたい})

父の車。  
Dad's car.

**Concomitancy** ([並立]{へいりつ})

行くの行かないの、迷っています。  
I am hesitating to go or not.

**Substitution** ([代用]{だいよう})

走るのが好き。 (same as 走ることが好き。)  
I like running.

That said, there are of course more nuanced uses of の but if you can clearly
understand and use these 3 roles, you made the hardest part.
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