"innuendo", in "Down The Road", by Lowell George (Little Feat) My guess being that there are others by him.
Innuendo is in loads of songs, Stumble - Natasha Beddingfield Disclaimer - The Offspring Where's the Orchestra? - Billy Joel Love Vodoo - Duran Duran your starter for 4...
I’m under the impression we’re looking for words we have heard only in a song, not for a word that appears only in one song. And so “pilchard” is a word I’d never heard before “I Am the Walrus,” whereas “semolina” is a word I’m pretty sure I’ve heard elsewhere. (Whether said words appear in other songs is beside the point.) If I’m misunderstanding the OP’s intent, someone please let me know.
"Reminiscent" (The Four Pennies - Juliet) Ok, chances are "Reminiscent" has been used elsewhere in a pop lyric a few times since then, but I certainly wasn't used to hearing words like "reminiscent" in pop records of 1964 - and a UK number one to boot! (I was later to hear Buddy Holly's "Reminiscing", but I'm still waiting for another "reminiscent'.
Vicissitude Fragile to the waves Vicissitude of days When I am with you I feel a little brave Float by Bush (at the 1:44 mark)
Neil Diamond once wincingly rhymed "Sang" with "Brang" in a huge hit record. Any other instances of "Brang"? From Play Me Song she sang to me Song she brang to me Words that rang in me Rhyme that sprang from me
and Cole Porter My story is much too sad to be told, But practically everything Leaves me totally cold. The only exception I know is the case, When I'm out on a quiet spree, Fighting vainly the old ennui And I suddenly turn and see, Your fabulous face. I get no kick from Champagne.............
Not saying it doesn’t appear in other songs, but I don’t recall hearing “roulade” anywhere besides Steely Dan’s “Your Gold Teeth.” And sticking with the Dan, also “retsina” in “Home at Last.”
I give you a whole song full of words never heard before or since: "on the Amazon".. a brilliantly written song covered by Don McLean: "On The Amazon" There's a danger zone, not a stranger zone Than the little plot I walk on that I call my home Full of eerie sights, weird and skeery sights Every vicious animal that creeps and crawls and bites!! On the Amazon, the prophylactics prowl On the Amazon, the hypodermics howl On the Amazon, you'll hear a scarab scowl and sting zodiacs on the wing All the stalactites and vicious vertebrae Hunt the stalagmites while laryngitis slay All that parasites that come from Paraguay in the spring Hmm, hmm hmmm Snarling equinox among the rocks will seize you And the Fahrenheit comes out at night to freeze you Wild duodenum are lurking in the trees And the jungle swarms with green apostrophes Oh, the Amazon is calling me On the Amazon, the pax vobiscum bite On the Amazon, the epiglottis fight On the Amazon, the hemispheres at night all slink where the agnostics drink All the hippodromes that lie concealed in mud Hunt the metronomes that live in swamp and flood Then the kodachromes run out and drink their blood, poor ginks While velocipedes among the weeds will scare you And the menopause with hungry jaws ensnares you Frenzied adenoids infest the hills and slopes Everyone avoids the deadly stethoscopes Oh, the Amazon is calling Yes, the Amazon is calling Oh, the Amazon is calling me-ee!!
Jethro Tull - Down At The End Of Your Road "I am your neighbor. I seem most respectable / But underneath I'm an iniquitous toad ..."