A group of words in a poem, can be a complete or a fragment sentence
Stanza
A group of lines in a poem
Form
How the poem is laid out on the paper or screen, includes the position of the stanza (right, middle, left), the use of punctuation marks (full stop, comma, etc), and the use of capital letters
Poet
A person who writes poems
Rhyme
The repetition of similar sounds in a poem
rhyme scheme: a pattern of sound repeated at the end of a line in a poem