There are several emotes that have alternative names for the same animation. However, when using said alternative names, they do not autocomplete.
My suggestion is to allow the alternative names to not only auto-complete, but when the autocomplete option shows up, the names of the "official" emote name and alternative emotes to also show up, if possible.
For example, /bonesaw alternative commands are (/ready; /goingnowhere, /playtime, /threeminutes.) Upon typing /rea..., the other names for the emote could show up.
The reason I suggest this is that for some emotes, I've associated their alternative names over the "official" name. For example, I do /ready instead of /bonesaw to indicate I'm ready for whatever.