Technically accurate, but not general enough. A futanari, as I understand, is a person who has a penis, but otherwise has the physical characteristics typically designated "female" (breasts, wide hips, etc.). A no-op trans woman would fit this description, but so would someone who started out with the typical "female" phenotype but had their genitals modified and kept the rest of their body the same. (As far as I know, this hasn't happened in real life, but it's theoretically possible.) Also, though I'm not aware of any such condition, I suppose there could be an intersex condition that produces a "futanari" phenotype. (If anyone is aware of one, I'd be curious to hear about it.)