好像一首叫poem，多了就是poetry，反正我是这么理解的，笑。

Poetry is the result of the delineation of concepts and feelings by means of the use of the various elements of a language. Sounds and rhythms of words constitute the elements of language. Poetry is characterized by what is called prosody. Prosody is the science of patterns of rhythms. Since rhythms form the basis of poetry, it is often compared to music. This is because of the fact that music too is qualified by the presence of rhythms. The word poem is often used in the sense of an individual piece of work. Poetry is a collected work. In other words it is a collective term used to indicate many pieces of individual poems. Poetry is a literary form whereas a poem is a written piece of work. http://www.differencebetween.com/difference-between-poem-and-poetry/

A poem is a single piece of poetry.

* Poetry is a literary form, whereas a poem is a written piece of work. * Poetry is an art form, whereas a poem is a composed work. There is a difference in their inner meanings. Their connotations do differ to some extent. * A poem is a piece of literary work. * Poetry is an art form. In short it can be said that poetry is one of the forms of fine arts. A poem is the fundamental unit of poetry. It can thus be said that poetry is made of poems. In other words you can say that poems constitute the art form of poetry.