"transwomen" -- compound word like "crayfish" which ain't. The adjective-noun pair more or less concedes -- as many transactivists argue -- that transwomen actually are women. Like "black women" or "Chinese women".
Transwomen won't ever qualify as women, as "adult human females", since they lack, and won't ever have, the more or less essential and defining quality of that category -- i.e., ovaries.
Y'all may wish to peruse even more reputable popular dictionaries which underline the point: