Except that “space” as used here and “space” as used in those contexts that make it one of the “ten hundred” most used words (interesting that “thousand” isn’t one of the thousand most used words, evidently*) mean two rather different things. Are “space”, “physical extent or area; extent in two or three dimensions” and “space”, “the physical universe (excluding celestial objects) beyond the earth’s atmosphere” the same “word”? Is “set” in all its many meanings just one “lexical unit”? (Runs away ...)
Edit: apparently it is, according to this - number 480.