Is it grammatically correct to say something like:

> 友達と遊ぶこと **や** 食べることが好きです。
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question
word-choice particle-と particle-や
Difference between AとB and AやB
I did a quick [Google ブックス](https://books.google.co.jp/) search for "ことや" and
got results such as:

  * > なにかしらの心的態度を変える **ことや** 、しているなにかをやめる **ことや** 、やり方を変える **ことや** …

  * > 能天気にラッキーな **ことや** ツイてる **ことや** 、いいことばかりとは限りません。いやな **ことや** 、辛い **ことや** …

  * > 辞職にも通ずる **ことや** し…

Based on the results, I think it's safe to say that it's grammatically
correct. However, there are more common ways to express strings of verbs like
とか or 〜たり〜たりする.
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To answer your question: Yes, it is grammatically correct.

* * *

For your info / what you are not clear of:

> 友達と遊ぶこと **と** 食べることが好きです。  
>  I love to eat and play with friends.  
>  (And thats all, not sure if I love to do anything else with them. )
>
> 友達と遊ぶこと **や** 食べることが好きです。  
>  I love to eat and play with friends.  
>  (Well actually there are much more I love to do with my friends but play
> and eat will be two of them.)

So the difference of と and や will be：

  * と： _list things out and that's everything of it._

  * や： _list a part of all things out that belongs to the same group._

That is also why according for some Japanese と got the nuance of more
"separating" and や feels more like things belongs to the same group.

Hope that helps.^^
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