Affair, act, and action are all synonyms for activity. Inactivity and idleness are antonyms of activity. And here are 28 another word for activity.
Act, action, affair, business, campaign, deed, diversion, doing, enterprise, entertainment, exploit, hobby, interest, job, lark, manoeuvre, occupation, pastime, project, pursuit, recreation, scheme, task, thing, undertaking, venture, and caper are all synonyms for activity.
Activity synonym page has a variety of synonyms that differ in length. 2 synonyms with 3, and 9 letters and 3 synonyms with 4, 5, 6, 8, and 10 letters. 5 synonyms with 7 letters and 1 synonym with 11, and 13 letters. For a total of 26 another word for activity.
The activity at the festival was exciting.
Students engaged in group activity after class.
I observed a lot of activity downtown today.
Hiking is my favorite outdoor activity.
There's always some new activity to try.