Question: "post" used in the same way in the following two sentences?

I'll post the news on the bulletin board.

Post a sentinel in front of the door.
Answer: different meanings
Question: "congregation" used in the same way in the following two sentences?

A great congregation of birds flew over.

A congregation of children pleaded for his autograph.
Answer: the same meaning
Question: "operation" used in the same way in the following two sentences?

A large-scale farming operation.

It can perform millions of operations per second.
Answer: different meanings
Question: "product" used in the same way in the following two sentences?

They improve their product every year.

The product of 2 and 3 is 6.
Answer:
different meanings