Collocations for activity - noun

frantic, frenetic, heightened, increased, intense
The scene was one of frenetic activity.

criminal, illegal, subversive, suspicious, terrorist
His income was derived from criminal activity.

class (esp. AmE), classroom, group
after-school, extra-curricular, leisure, leisure-time, outdoor, recreational, social
Shopping is now a leisure activity.

mental, physical, sexual
They had engaged in sexual activity in the past three months.

aerobic, strenuous
business, commercial, cultural, economic, industrial, intellectual, political, scientific
government, military, police, union
human
electrical, seismic, volcanic
The islands were formed by volcanic activity.

burst, flurry
There was a flurry of activity as the movie star appeared on the balcony.

level
Newspapers report a higher level of activity in the foreign-exchange markets.

conduct, do, perform
Here's an activity you can do with mixed-ability classes.

be involved in, engage in, participate in, take part in, undertake
We suspect he may be involved in illegal activities.
Teachers here are not allowed to engage in any political activity.

stop, suspend, terminate
The party's activities have been suspended.

stimulate
It will only be possible to stimulate business activity with an injection of public funds.

curb, inhibit
coordinate, regulate
measure, monitor
resume
bustle with, buzz with
The room was buzzing with activity.

a hive of activity (= a very busy place)
The classroom was a hive of activity as the children prepared for the concert.

a sign of activity
Police watched the house all day, but there was no sign of activity.