Rhymes

The pig, if I am not mistaken,

Gives us ham and pork and bacon.

Let others think his heart is big.

I think it stupid of the pig.

~ Ogden Nash

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What do you use to cover a hogback? Easy. A blanket. Pigs in a blanket. Or maybe a cloak? Pork in a cloak? 

Pork and cloak don't rhyme but they almost sorta do. That's called a slant rhyme. It's also called a "those words don't rhyme."