What do baseballs and kings have in common? The answer is supposed to be two sets of homophones

thrown (throne) has to be one.

To find another set of homophones, we need to look for words that sound alike but have different meanings. Here's one:

1. Throne (a ceremonial chair or seat of a king or queen)
Thrown (past participle of throw, meaning to propel something through the air)

Now let's find another set:

2. Reign (the period during which a sovereign rules)
Rain (water that falls from the clouds)

Here we have two sets of homophones related to baseballs and kings:

1. Throne (king's seat) and Thrown (past participle of throw)
2. Reign (king's rule) and Rain (water falling from the sky)

So, baseballs and kings have these two sets of homophones in common.