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What is the difference between amortization of loan & Unwinding of a discount?

A loan measured at amortised cost means that any premium/discount and related transaction costs are recognised in P&L using the effective interest rate.

The terms used in your question are not part of the IFRS terminology, but to put it simply, the unwinding of a discount is part of the loan amortisation (note that if transaction costs exist, they must also be amortised).

I understand it a bit differently.

To me, unwinding of discount is a narrower term used for items recognised at discounted amount, i.e. lower than face value. For example, you buy a zero-coupon bond for $95 with a face value of $100, and then you unwind (i.e. accrue) discount to arrive at $100 at redemption date. The same for non-financial liabilities recognised at discounted amount, e.g. decommissioning provisions.

Loan amortisation to me is a term that encompasses all accrued interest expense using amortised cost, including interest charged on the top of principal amount.

The discount is part of the loan's amortised cost. Its unwinding is done according do the effective interest method.