You searched for: “antivity”
antivity (s) (noun), antivities (pl)
1. A word play on the "activity of ants": The antivity of the children on the first day of school gave the impression to one teacher that they were running around like a bunch of ants.
2. Etymology: formed by ant + ivity [-ity "condition or quality of being"].
This entry is located in the following unit: English Words in Action, Group A (page 5)