I use the tag "semianthro" when it feels like they are a bit more biped, this term is standard on a lot of furry sites as far as I've seen it been used. Though, I see any animal that is even slightly anthropomorphised is still technically anthropomorphised.
Anthro is more adopted for very humanoid bipedal anthropomorphised characters. While feral is used more for quadrupedal but not all animals are bipedal so some species might be seen as more semianthro ambiguous as well as also feral. Anthropomorphism is a spectrum when it comes to visuals, as all the way from feral to 100% human appearance is anthropomorphic (I include 100% human because like with Greek gods, a 100% human appearance is when depicting an animal, concept or force as a human).
I personally like to draw ferals with some sense of anthropomorphic carriage, like it feels like more anthro at the neck and eyes. I like it when it feels like if they stood up or posed in certain positions that they would seem like they are fluidly semianthro and feral. A lot of feral artist do this, especially toon-style and were-style ones. I see people using "realistic/natural feral" to refer to the more animal-like overall. I tend to separate beast from feral. Beast-style is when they're solely animal characters by lore (non-sapient or can't talk) and they're even more beastly and less human-like than they would even be in real life. The anthro types, beast-man and werewolves are a different thing to beast, though I feel these words are getting more and more outdated. I've noticed more and more beast fans borrowing the term "feral", misrepresenting it as something entirely non-anthropomorphic and I don't consider beast-style as furry characters, while ferals are. I mention this because the point at which something is semianthro is more down to appearance, while feral is always subtly anthropomorphic (think Disney's Bambi/TLK/etc). Feral can be also semianthro or not as it's a bit of grey area as it depends on how mutative the style/character is. The word "feral" can also apply to anthros, too, but in a different sense (in this sense it refers to a sort of wild personality).