Haiku / Least Rhymable Word

There's no rhyme for "orange".
How do you write a poem?
Easy: use haiku.

There's a rhyme, really.
'Blorenge' is a mountain.
Ha, take that poets.

No rhyme for silver.
Good thing I only write these.
Haiku are awesome.

What about Wilbur?
It sort of rhymes with silver...
Some things I don't get...

So, "purple" and "month"
I haven't seen them mentioned
Where's your answer now?