This has been split from [this
question.](https://japanese.stackexchange.com/questions/9425/how-
is-%E3%82%82%E3%81%AE%E3%81%8C%E3%81%82%E3%82%8B-used).

So what are differences between two? Are there times where they can be
interchangeable or can they only be used in certain situations?

I saw this about
[ことがある.](https://japanese.stackexchange.com/questions/3977/the-different-
usages-of-%E3%81%93%E3%81%A8%E3%81%8C%E3%81%82%E3%82%8B)
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question
word-choice set-phrases
Is there a difference between ことがある and　ものがある？
For ものがある:

  * (plain form verb/i adjective/na adjective+な)+ものがある (Kanji 物がある, but I think it's usually written in Hiragana), can mean: 

>     * とても〜だ
>     * なんとなく〜感じる
>     * 〜という感じがある
>     * 〜ように感じられる

and is used in regards with things the speaker felt, for expressing feelings
while describing the characteristics of something, or that a certain
characteristic can be seen, for example:

> 半年前にいなくなったねこが帰ってきた。わたしにとって特別うれしいものがある。  
>  "The cat which disappeared half a year ago has returned. To me it's
> special, and I feel very happy."
>
> この文章はまだまだ未熟だが、しかし随所にキラリと光るものがある。  
>  "This sentence has still got some way to go, but it twinkles at every
> turn."
>
> この絵には人を引きつけるものがある。  
>  "This painting feels like it pulls a person into it."

You can also use 見られる, 認められる etc in place of ある here.

(Sources: 日本語文型辞典, どんな時どう使う日本語文型辞典500, the Kanzen master JLPT 2 grammar book).

  * It can also mean "there is a thing (generally a tangible thing)" (with the Kanji 物がある).

  * ものがある can also mean "there is a person" (written with the Kanji 者がある)

For ことがある:

  * It can mean "there are times when..." when expressed as plain form verb+ことがある and "there are times when it doesn't" when expressed as plain negative verb+ことがある

  * It can express that something has been experienced when expressed as plain past+ことがある, and that something hasn't been experienced when expressed as plain past+ことがない.

  * It can also mean "there is a thing (generally abstract)" as well. [(It is structurally ambiguous between an appositive clause and a relative clause)](https://japanese.stackexchange.com/a/3978/542)

The question you [linked
to](https://japanese.stackexchange.com/questions/3977/the-different-usages-
of-%E3%81%93%E3%81%A8%E3%81%8C%E3%81%82%E3%82%8B) describes these usages in
more detail, so I think I might leave those for now.

There are probably many other different usages too, but the two are generally
quite different to each other as far as I know. I think as a (possibly broad
generalization) that ものがある tends to be about feelings and tangible things and
ことがある tends to be about abstract things, experiences and occurrences etc.
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answer