milouse [1] filed a request to merge terminix [2] into tilix [3]: Terminix renamed to Tilix:

Note that Terminix is changing it's name to Tilix due to a trademark issue with the Terminix International Corporation. It may take a few weeks to complete the process, thank you in advance for your patience while we work through this change.

Merging the two packages will help users to better known which one they should install. [1] https://aur.archlinux.org/account/milouse/ [2] https://aur.archlinux.org/pkgbase/terminix/ [3] https://aur.archlinux.org/pkgbase/tilix/