The Devil is known
"as"
A roaring lion.
"Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour:"-1 Peter 5:8 KJV
Although,
Jesus
"IS"
The Lion from the tribe of Judah.
"And one of the elders saith unto me, Weep not: behold, the Lion of the tribe of Juda, the Root of David, hath prevailed to open the book, and to loose the seven seals thereof."-Revelation 5:5 KJV