Oh yeah? How about Phish:
Or
Evanescence has a song called "Tourniquet ".
To add to the thread, I’d say Sting’s shown some interesting vocabulary over the years. How’s about, *“A shoal of nightstars hang fire in the nets,” *to begin? (From The Soul Cages)
Bobby Brown’s “My Prerogative”.
At least two Oasis songs (“Shakermaker” and “Little James”) mention plasticene. Then again, I’m sure their intent was to remind the listener of the Beatles. 
It may not really count, but I’ve always had to give Weird Al props for “Ebay”, if only for the fact that he used the word “tchotchkes”.
To continue on the “really strange name dropping”: The Police “Don’t Stand So Close To Me”, which features the lines
It’s no use, he sees her
He starts to shake and cough
Just like the old man in
That book by Nabokov.
My favorite Pretentious Eighties Lyric is in Crowded House’s “Don’t Dream It’s Over”:
Try to catch the deluge in a paper cup.
I can’t think of too many artists that would ever use “deluge.”
Not a radio hit (though in a perfect world it would have been), but how about Van Der Graaf Generator’s “When She Comes”:
And the lady with her skin so white
Like something out of Blake or Burne-Jones…
You…you wiseapples! O.K., so “tourniquet” has been used elsewhere in a song lyric.
More Bonzo Dog Band possible semi-uniqueness: using and rhyming “minotaur”:
Like a sacrifice for the minotaur
All together in the Blood Rush Hour!
C’mon fish-face, you got the power!
(from “Busted”)
And in the category of unusual body parts references, we have the following from “Canyons of Your Mind”:
In the canyons of your mind
I will wander through your brain
To the ventricles of your heart, my dear
I’m in love with you again
Sorry, I’m gonna be a wiseapple again. The Incredible String Band:
A minotaur gets very sore,
His features they are such a bore,
His habits are predicta-bull,
Aggressively re-li-a-bull, bull bull…
(“The Minotaur’s Song.”)
She’s got Bette Davis eyes.
I could have sworn REM had a song with oleander in it, but it’s not coming up in searching.
My friend pointed out the rarity of pooh-pooh in songs, from Rent:
You need a place to do it
It’s what we always dreamed about
Think twice before you **pooh-pooh ** it
“No time for revolving doors” was always a favorite lyric of mine.
I totally fell in love with Queen the first time I heard the line “Scaramouche, Scaramouche, will you do the fandango?” When, soon thereafter, the exclamation “Bismillah” was used, I was ecstatic. Lyrics with semi-obscure words tickle me, and “Bohemian Rhapsody” has a bunch of oddities in it.
You’re probably thinking of “Find the River,” which has the similar sounding “coriander”, also a pretty uncommon word.
On second thought, that entire verse is a garden of oddities, so to speak:
There is nothing left to throw
Of Ginger, lemon, indigo,
Coriander stem and rose of hay.
Not a lyric, but there is (was) a band named Oleander.
Pete Townshend used the word “ennui” in the song “Exquisitely Bored” on one of his solo albums. I think it was All the Best Cowboys have Chinese Eyes .
How about Robert Pollard (of Guided by Voices and various other solo/collaborative projects)? He’s got to be the king of long-winded, unlikely song titles. Some examples: “Man Called Aerodynamics,” “The Ascended Master’s Grogshop,” “Big Chief Chinese Restaurant,” “Burning Flag Birthday Suit,” “Deathtrot and Warlock Riding a Rooster,” “Christian Animation Torch Carriers,” and “My Valuable Hunting Knife.”
ETA: Almost forgot one of my personal favorites, “Soul Train College Policeman.”
BAD RELIGION songs have pretty good vocab words, like superlative, prescience, progeny, supplicate and dichotomy.
Also, the Police mention “scilla and charybdis” in their song “Wrapped Around Your Finger.” That has to be pretty rare.
Thank you! Yes, I felt like it was off Automatic for the People.
Marilyn Manson has a song called Tourniquet, and it’s mentioned in Machine Head, by Bush. I think the word just appealed to the depressing rockers of the '90s. 
And as for auto-da-fe, there’s The Inquisition, from the Mel Brooks movie History of the World, Part 1. Best part of the whole song, I think:
“Hey Torquemada, whaddaya say?
I just got back from the auto-da-fe
Auto-da-fe? What’s an auto-da-fe?
It’s what you oughtn’t to do, but you do anyway.”
The song is Polythene Pam, but Polythene and Polyethylene are the same thing. Radiohead has a song called Polyethylene, Parts 1 & 2. Part 2 is one of their greatest B-sides.
Anyway, you could do a whole thread like this just about Bad Religion.
A myoma, turns out, is a tumor made up of muscle tissue.
And I spent so much time previewing this post to check more BR songs that someone else mentioned them before I did. Whoops.
Bad Religion uses a fair number of uncommon words in their lyrics. And, as mentioned in this thread, lead singer Greg Graffin has a Ph. D.
From Fuck Armageddon, This is Hell:
We’re living in the denoument of the battle’s gripping awe,
So what’s the use of being good to satisfy them all?
From The Answer :
and he was quick to write his revelation
but as they were scutinized
and
but if you’ve got enough naivete
and you’ve got conviction
From Struck a Nerve:
In negative disposition
As I’m bombarded by superlatives
Realizing very well that I am not alone
Introverted
I look to tomorrow for salvation
But I’m thinking altruistically
Jim Morrison mentions bungalows not once but twice, in “LA Woman” and “Roadhouse”. I can’t recall anyone else using the word even once.