Every character on Jiǎoluò Shūwū read as huo in any tone — 2 readings total across the four tones. Pick the tone you mean.
If you have the sound huo but not the character, here are the 2 characters read this way: 活 (huó, to live, to be alive, lively, work), 火 (huǒ, fire, flame, anger, popularity). They split across 2 tones, so the tone is what separates them.