A small group within a larger group is often referred to as a "subgroup." This term can apply in various contexts, such as in social, organizational, or research settings, where the subgroup may have specific characteristics or interests that differentiate it from the larger group. Other terms that might be used include "faction," "segment," or "division," depending on the context.
A small group of stars that appear to be close together are often known a cluster. Technically its an asterism.
What a group of warriors is called generally depends on the size of the group. A small group is a squad. A somewhat larger group is a platoon or company. At the far end of the spectrum is an army.
committee
A flotilla
Microscopes
controlled experiment
Plain smart
For example, a bicycle pump will do that.
you call them a fleet but if they are wardhips you call them armada
The instrument used to make extremely small things look larger so humans can see them is a microscope.
The definition would be applicable to:anteroombathroombaybowercompartmentclosetcubbyholecubiclenicherecessstudyvestibule
Magnifying Glass, Microscope