no other words in the English language rhyme with month, orange, silver or purple

Ogden Nash would have had a ball with these words ... I can imagine it .....purple somehow managing to end up in one of his poems rhymed as "slurp ill."
One of my favorites of Mr. Nash's imaginative poems :

The turtle lives twixt plated decks
Which almost entirely conceal its sex
I think it clever of the turtle
In such a fix to be so fertile.
wow