a Quatrain
A stanza of two lines is called a couplet.
a sestet.
Four lined poem or stanza
A four-line stanza is called a quatrain.
A 3 lined stanza from a poem that can or doesn't half to rime.
A miscellaneous 8 line stanza is called an octet. But the 8 line stanza which forms the first verse of a sonnet is called an octave, and the commonest form of 8 line stanza (by far) in English is called ottava rima.
A stanza of four lines is called a quatrain.
A 5 line stanza is called a cinquain
a stanza with 5 lines is called a sestet
A stanza of two lines is called a couplet.
I believe you are looking for the word STANZA
a 2 line stanza is called a couplet.