There are different words the Bible uses for rain. Yoreh (or moreh) literally means “shoots,”” as well as “teacher,” while the word malkosh is related to the Hebrew word mekoshesh (reaper). Malkosh is the name given to rain which falls at the onset of spring (Pesach-time). Its name is related to the Hebrew word for reaping because malkosh falls near the harvest season, right before the produce is reaped. The different words for rain are not simply a product of the agricultural importance of rain; they refer to different ways in which G-d provides for the world, offering exactly what we need, when we need it.
Source: Israel in the News