Haiku vs. Senryu

Senryu:

senryū tend to be about human foibles while haiku tend to be about nature, and senryū are often cynical or darkly humorous while haiku are serious

Senryū is a similar poetry form [to Haiku] that emphasizes irony, satire, humor, and human foibles instead of seasons, and may or may not have kigo or kireji.

Haiku:

a major form of Japanese verse, written in 17 syllables divided into 3 lines of 5, 7, and 5 syllables, and employing highly evocative allusions and comparisons, often on the subject of nature or one of the seasons.