A gang of robbers had broken into my neighbour's house the previous night. What type of noun is gang?

Collective Noun:
A Collective Noun is the name of a number (or collection) of persons or things taken together and spoken of as one whole.
Ex: Crowd, mob, gang, team, flock, herd, army, fleet, jury, family, nation parliament committee etc.

Gang শব্দের অর্থ দল, যেটা দিয়ে সমষ্টি বুঝায়,
তাই এটা Collective Noun.


Few things to be noted:
A fleet = a collection of ships or vessels.
An army = a collection of soldiers.
A crowd = a collection of people.
- All of these are used as Collective Noun.