subgroup
n. countablen. a smaller group of people or things that is part of a larger group. You use this when you want to talk about a specific set within a bigger category.
n. a subordinate group consisting of members from a larger parent group. Often used in statistical or sociological contexts to identify specific sets within a population.
The researchers studied a small subgroup of the patients.
Within the local gardening club, a subgroup of members focuses specifically on growing rare orchids.
The data analysis revealed that a specific subgroup of participants responded much more favorably to the treatment than the general population, suggesting a genetic link to the drug's efficacy.
From sub- + group.
Often followed by the preposition 'of' to identify the parent group.