cum v sperm v sperm cell

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When I think of the usage of cum I usually think of a zoomed-out look at white goup.

Sperm cell otoh is liked a zoomed-in microscope of the competing tailed things which fertilize an ovum (which we should avoid calling an egg)

The term sperm seems like it falls in the middle (could describe either) and thus is functionally useless and potentially confusing, is there a purpose for having it?