Couplet

Definition: a pair of lines in poetry.

Example:
Goose and Moose
It's hard to tell just what a goose
will have in common with a moose.
Or better yet, just what three geese
will have in common with three meese.
(Is that the plural for a mouse?
Is grice the plural for three grouse?)
I'll say this once, I'll say this thrice,
the plural for a moose is mice,
or plural for three mice is meeses.
I think that I may fall to pieces.
I feel my dizzy state increase
about the mice, the grice and geese.

by Denise Rodgers

Significance: to make us to think about what are they comparing.