Why did Abraham use a ram instead of a lamb to sacrifice at Mount Moriah?

In

Gen 22:8 And Abraham said, "My son, God will provide for Himself the lamb for a burnt offering." So the two of them went together.

The Hebrew Word, which is translated into English 'lamb', means a male lamb.

But in:

Gen 22:13 Then Abraham lifted his eyes and looked, and there behind him was a ram caught in a thicket by its horns. So Abraham went and took the ram, and offered it up for a burnt offering instead of his son.

The Hebrew Word which is translated into English 'ram' means a male sheep.

So it is not clear why the two different Words are used but it was a ram that God provided.