roundlet
A Septet
You are referring to "haiku."
verse
A five line nonsense verse is known as a limerick
All blank verse has ten syllables per line.
A line. Ex: lines 1 through 4 uses internal rhyme
Half a line of verse is called a hemistich. A hemistich is a division of a line of poetry into two parts, often creating a pause or a sense of completion within the line.
A verse is generally considered to be a single line in a metrical composition, e.g. poetry
Rondelet
a verse
A line that is repeated at the end of each verse is called as REFRAIN.
Free verse is the verse in which "Oedipus Rex" was written by Sophocles (495 B.C.E. - 405 B.C.E.).Specifically, free verse does not have a predictable structure. For example, its meter respects no distinct pattern. Its rhythm varies from line to line.