Why some may use woman as an adjective

Hélène from France wrote in a comment on the "Woman is not an adjective!" post her thoughts about how so many people began to use the word in the wrong way. "We often use "femme" (woman)for words that do not have any feminine form," she wrote. "For instance : une femme médecin, as you wrote, a "woman doctor." Check out her entire comment here.