Haiku
(plural: haiku!):a three-line poem containing a kigo (season word) and a kireji (cutting word in Japanese, or a pause).
Hokku:
traditionally, a first stanza in renga.
Before Shiki, the name for what we now know as haiku.
Senryu:
a poem dealing with human affairs, usually written in the same form as haiku but without a kigo.
A single ant gets a good girl
and as river-banks lie
man and wife
Sheltering from the rain,
the letters on the Buddha's forehead
I study hard!
Renga
(linked verse):a linked poems usually composed by two or more poets (5-7-5 and 7-7 onji).