Tab Separated Values tsv should be a synonym to csv as one of the Character Separated Values as it is a delimiter that can be used as an alternative to the comma ,.
I know csv states it is for comma separated values, but the handling of both file-types is very similar and overlapping.
Currently there is one question tagged tsv (which is pretty surprising), but I don't see a reason to destroy it or re-tag it. A search for related tags for tab separated values
did not reveal any additional tags.
A rudimentary search reveals 14 questions that could also benefit from the tsv tag, but only one has the csv tag.