Question: words that are also roman numerals?
Answer: There are only two common, everyday words which are valid Roman numbers - I (1) and mix (1009). But there are seven words altogether - div (504), dix (509), I (1), li (51), mi (1001), mix (1009), and xi (11). The Scrabble Dictionary (third edition) also allows di (501), which is really just a prefix.