Horto is like in horticulture and phagos is like in phagocytosis. Very surprising language.
So literally a hortophage, or plant-eater?
(Though the meaning of χόρτο in modern Greek is generally a bit narrower in practice, as troll said: singular χόρτο for grass, plural χόρτα for (green, leafy) vegetables.)
Does that mean vegan or vegetarian? It shows both as meaning but they are two totally different things!
Yes, I suppose, but from my personal experience, vegans gonna like it if you use one of the above (the last two, I find ακραιφνής very formal). ;)
Maybe just the Greek lessons. In French and German, something is always eating a bird or a mouse or a chicken!
you may use either gender depending on the subject you're referring to. Like if you're talking about a female vegetarian it would be "η χορτοφάγος" but a male one would be "ο χορτοφάγος"
It can be either.
As a noun, it's masculine (like most nouns in -ος).