That tag is strange, while looking for a tag "purifying" that tag shows up. And I don't really know the purpose of that tag. Currently there are no questions under that tag.
I don't see a reason to remove it. Just because nobody has thought of using it doesn't mean that nobody will do so in the future. And I see no red flags with it - it is not suffering from homonym problems, or from being a meta-tag.
Is it possible that there is a language issue?
Puree is a culinary term used for mashed vegetables, but if you have not heard it, maybe you thought that it is not a real word? I admit that it is somewhat uncommon in English.