What is a synonym for haiku?

There isn't really a true synonym for haiku, as it's a unique form of poetry with specific rules. However, you could use some terms that capture the essence of haiku, like:

* Short poem: This highlights the brevity of haiku.

* Nature poem: Many haiku focus on natural imagery.

* Three-line poem: This describes the haiku's structure.

* Verse: This is a general term for a line of poetry.

* Tanka: This is a Japanese form of poetry similar to haiku, but with a longer structure.

Ultimately, the best way to describe a haiku is to simply call it a "haiku."