λέων

2 Timothy 4:17 λέοντος. of the lion.

But the Lord stood by me and strengthened me, so that through me the message would be fully proclaimed, and all the Gentiles would hear it. So I was delivered from the mouth of the lion.

Here: "Of a lion" (Greek has no article here). It is almost certainly a figure for mortal danger, taken from Psalm 22 and the Daniel story, not a literal arena beast. Who or what the lion stands for is debated.

Hebrews 11:33 λεόντων, of lions,

who through faith conquered kingdoms, administered justice, and gained what was promised; who shut the mouths of lions,

Here: This mainly recalls Daniel in the lions' pit (Dan 6). Samson, David and Benaiah also killed lions (Judg 14:6; 1 Sam 17:34–37; 2 Sam 23:20), so the phrase could take in more than one story.

1 Peter 5:8 λέων a lion

Be sober-minded and alert. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.

Here: The deadliest predator in the biblical imagination, and a stock image for violent oppressors and for the enemies who surround the suffering righteous one (Psalm 22:13).

Revelation 4:7 λέοντι, as a lion,

The first living creature was like a lion, the second like a calf, the third had a face like a man, and the fourth was like an eagle in flight.

Here: The lion was the classic picture of royal strength and the strongest of the wild animals (Proverbs 30:30). It is one of the four faces in Ezekiel 1:10.

Revelation 5:5 λέων Lion

Then one of the elders said to me, “Do not weep! Behold, the Lion of the tribe of Judah, the Root of David, has triumphed to open the scroll and its seven seals.”

Here: The royal, warlike animal of Genesis 49:9. It stands for the expected Messiah from Judah who wins by force.

Revelation 9:8 λεόντων of lions

They had hair like that of women, and teeth like those of lions.

Here: 'Of lions'. The lion was the most feared predator in Israel and the standard biblical picture of violence that cannot be resisted. Revelation uses lions elsewhere for both royal power (5:5) and beastly menace (13:2).

Revelation 9:17 λεόντων, of lions,

Now the horses and riders in my vision looked like this: The riders had breastplates the colors of fire, sapphire, and sulfur. The heads of the horses were like the heads of lions, and out of their mouths proceeded fire, smoke, and sulfur.

Here: Lions stand for ferocity and deadly power. The locusts already had 'teeth like lions' teeth' (9:8; compare Joel 1:6).

Revelation 10:3 λέων a lion

Then he cried out in a loud voice like the roar of a lion. And when he cried out, the seven thunders sounded their voices.

Here: The image of overwhelming, fear-inducing power. For readers who knew the prophets, God himself is the one who 'roars like a lion' (Amos 3:8; Hosea 11:10). Christ has already been called 'the Lion of the tribe of Judah' in 5:5.

Revelation 13:2 λέοντος. of a lion.

The beast I saw was like a leopard, with the feet of a bear and the mouth of a lion. And the dragon gave the beast his power and his throne and great authority.

Here: The first beast of Daniel 7:4. Elsewhere Revelation calls Christ 'the Lion of the tribe of Judah' (5:5); the beast has only a lion's mouth, an imitation of that royal power.