What is a singular word videos bacteria geese or mathematics?

The singular Word among "videos," "bacteria," "geese," and "mathematics" is "mathematics." "Videos," "bacteria," and "geese" are all plural forms; "video" is singular for "videos," "bacterium" for "bacteria," and "goose" for "geese." In contrast, "mathematics" is typically treated as a singular noun, despite referring to a field of study that encompasses numerous concepts.