The order of the verses is different
in the various sources I checked. 

Furthermore, a careful look at the
rhyme scheme indicates that the
"tags" for verses four and five...

 "You're a three...with arsenic sauce!"
       and
 "Your soul is ...in tangled up knots!"

...ought to be swapped.

The lyrics given here, however, are
as they are sung on the video version
of How the Grinch Stole Christmas.
 

You're a mean one, Mister Grinch
You really are a heel,
You're as cuddly as a cactus, you're as charming as an eel, Mister Grinch,

     You're a bad banana with a greasy black peel!

You're a monster, Mister Grinch,
Your heart's an empty hole,
Your brain is full of spiders, you've got garlic in your soul, Mister Grinch,

     I wouldn't touch you with a thirty-nine-and-a-half foot pole!

You're a vile one, Mister Grinch,
You have termites in your smile,
You have all the tender sweetness of a seasick crocodile, Mister Grinch,

     Given a choice between the two of you I'd take the ... seasick crocodile!

You're a rotter, Mister Grinch,
You're the king of sinful sots,
Your heart's a dead tomato splotched with moldy purple spots, Mister Grinch,

     You're a three decker sauerkraut and toadstool sandwich, with arsenic sauce!

You nauseate me, Mister Grinch,
With a nauseous super "naus",
You're a crooked dirty jockey and you drive a crooked hoss, Mister Grinch,

     Your soul is an appalling dump heap overflowing with the most disgraceful
        assortment of rubbish imaginable, mangled up in tangled up knots!

You're a foul one, Mister Grinch,
You're a nasty wasty skunk,
Your heart is full of unwashed socks, your soul is full of gunk, Mister Grinch,

     The three words that describe you are as follows, and I quote, "’Stink’, ‘Stank’, ‘Stunk!’" 

  (The file has been compressed
        to 644k using Stuffit.)