We all know blueberry syrup’ll
Make your tongue turn purple
There’s also the classic from The Wizard of Oz:
“And if you met a hippopotomus?”
“I’d knock him from top to bottomus!”
(Of course, that only works if you pronounce “syrup” with a Southern accent…)
No need to go for an alternative pronounciation of sitar to find a rhyme.
“Cigar” and “afar” are rhymes for guitar.
I think the following are close enough (but not as good as “door-hinge”!!)
Orange - Forage, Porridge
Orange - Poor Mensch
I worked in the library in college and when it was slow, I’d browse the OED (the honking 20 volume set, not the measly 3 volume abridged edition.) I remember finding the word ‘porringe.’ IIRC, it’s a dialectal variant of ‘porridge’ or ‘potage’ and it’s related to ‘porringer,’ those useless little bowls everyone gives babies for christening gifts. Any road, it rhymed with ‘orange.’
:mad:
Anyway…
The name “Penelope”
L-M-N-O-P! 
Orange
Whore-binge
Sore cringe
Back when Marvel Comics launched Epic Illustrated, they had a contest to find a word that rhymed with “epic.” I forget who won; it sure wasn’t my entry, “instep-pick.”
Australopithecus?
Don’t be ridiculous.
Easy. A creationists’s clerihew:
God knows Australopithecus
Was just a creature mythic. Us
humans, made in Eden
Is all that Faith is needin’.
Roses are red, violets are purple
Sugar’s sweet and so is maple syrple.
- Roger Miller
When it rains in torrenges
I like to eat oranges.
- Ogden Nash
*From Texarkana to El Paso, Dalhart down to Orange
Every spot in Texas has got what you’re looking forrrrr
Aren’cha glad that Texas put the stars up in the sky
If heaven isn’t Texas, pardner, I don’t want to die *
- Hank Card for the Austin Lounge Lizards (One More Stupid Song About Texas)
Thinking about this, in Ireland, you’d more than likely hear a word that rhymes with month. In fact, depending on the circles you move in and what your shockometer is set at; you’d could end up looking like this :eek: YMM, indeed V
I ain’t writing it down here as it’s not a word I ever use, being such a polite and refined individual. 
Really, though, I’m not sure if I’d be breaking any Dopey rules for this forum, so I’ll give it a misss, if you don’t mind.
However, I’m feeling a bit lyrical, so here’s a hint:
*Word that rhymes with month in Ireland *
by Me.
It’s first is in church and also in chapel
It’s second’s in rhubarb; but not in apple
It’s third’s thrice in Shannon but never in Liffey
The last letter’s t and the whole word’s quite iffy.
I shall say no more; that’s quite enough from me today.
Lemon
Denim
Okay, not an exact rhyme, but then, a lot of these aren’t.
Dammit, where are the specs for the English language. I must have them around here somewhere. Where’s that section that says that all words must have rhymes? It must be in there somewhere…
Yemen
I just heard of this Burns snippet, which I just had to post here:
OK, so it’s Scots, not English, but it’s still a perfect rhyme, in real poetry. 
Its odd how many of these are colors: purple, orange, silver, even lemon. Maybe there was one guy who came up with the color names and he made them not rhyme just to spite us.
quotient
Quotient doesn’t work. A proper rhyme has to match from the vowel of the last stressed syllable to the end. Since “patient” and “quotient” are both stressed on the first syllable, they would have to agree on that syllable, which they don’t.