What do you call a group of lines in a poem?

A group of lines in a poem is known as a stanza. Stanzas serve a similar function to paragraphs in prose; they organize thoughts, concepts, or themes within the poem. Each stanza can vary in the number of lines it contains and can follow different rhyme schemes or rhythms. This structure helps to create a visual and auditory flow within the poem, allowing for clearer communication of ideas and emotions.

In contrast, terms like act and scene are more commonly associated with plays instead of poetry, where acts define larger segments of the play and scenes indicate the specific moments within those acts. The term "line" refers to a single row of text in a poem rather than a group of lines. Thus, identifying a group of lines as a stanza accurately reflects the structural component within poetic form.