What is the term for a word whose definition is the word?

Question

for example:
poetry: literary work written in verse, a poem
poetry: a collection of poems

Answer 1

A circular reference?

Answer 2

Weellll a good definition is never just the word.

Here is the definition I found:

po·et·ry ( P ) Pronunciation Key (p-tr)
n.
1. The art or work of a poet.

2. Poems regarded as forming a division of literature.
3. The poetic works of a given author, group, nation, or kind.
4. A piece of literature written in meter; verse.
Prose that resembles a poem in some respect, as in form or sound.
5. The essence or characteristic quality of a poem.
6. A quality that suggests poetry, as in grace, beauty, or harmony: the poetry of the dancer's movements.

Answer 3

Oh! I thought you were going for onomatopoeia. Like POP sounds like POP Meow is Meow Dang is um well DANG!!!

Answer 4

I believe you already answered your question, it's called a "term".