The word "pooka" is a type of mischievous fairy or imaginary creature that is commonly found in Celtic folklore. There are several synonyms for this word that can be used interchangeably, such as "puca," "phouka," or "pwca." These terms all refer to the same type of mythological creature and can be used depending on the particular dialect or time period being referenced. Other similar words that can be used to describe similar creatures include "fairy," "elf," "sprite," or "gnome." Despite the variations in regional vernacular, the concept of a playful and sometimes mischievous spirit creature is a common thread throughout many cultures and mythologies around the world.