Business expenses and Operating expense

Operating expense and business expenses are semantically related In some cases you can replace phrase "Operating expense" with "Business expenses", this phrases are similar.

Operating expense noun - The expense of maintaining property (e.g., paying property taxes and utilities and insurance); it does not include depreciation or the cost of financing or income taxes.

Business expenses and operating expense are semantically related in money needed to run a business topic. You can use "Business expenses" instead a noun phrase "Operating expense".