What are poem verses called?

The term you are looking for is "stanzas". A stanza is a group of lines in a poem that are set off from the rest by spacing or indenting. Stanzas can vary in length and structure, and can be used to create different effects in poetry. For example, a poem may consist of a single stanza, or it may be divided into multiple stanzas of varying lengths. The arrangement of stanzas in a poem can also affect the poem's rhythm, meter, and overall tone.