Noun meaning

[yingbonnie]

Dear teacher,

There is a sentence : Their excrement smelled so bad.

How about this sentence. Their excrement were very stinky.

Could I say that they have the same meaning?

Best regards,

Bonnie

[Josef]

1. Their excrement smelled so bad.
2. Their excrement were very stinky.

Could I say that they have the same meaning?

Yes, same meaning.

But, as far as I know, excrement is uncountable, so 2 should be:

Their excrement was very stinky.

Stinky is informal. Though possible, it is a strange combination with the formal word excrement. More formally, you could use the verb to stink and say:
Their excrement stank.