Step 1: Nature of debenture.
Debentures are instruments of debt issued by a company to raise funds. They represent the liability of the company towards lenders.
Step 2: Classification.
- Share capital → Owners’ funds.
- Debentures → Loan funds (borrowed capital).
Step 3: Term.
Debentures are normally repayable after a long period, hence they are classified as long-term borrowings.
Final Answer:
\[
\boxed{\text{Long-term borrowings}}
\]