subgroup

• POS: Noun
• HYPHEN: sub=group

CIDE DICTIONARY

subgroup, n. 

 A subdivision of a group, as of animals.  Darwin.  [1913 Webster]

OXFORD DICTIONARY

subgroup, n. Math. etc. a subset of a group.

THESAURUS

subgroup

adjunct, blood, bracket, branch, caste, category, clan, class, component, contingent, cross section, detachment, detail, division, dole, estate, fraction, grade, group, grouping, head, heading, installment, item, kin, label, level, order, parcel, part, particular, percentage, pigeonhole, portion, position, predicament, quadrant, quarter, quota, race, random sample, rank, rating, remainder, rubric, sample, sampling, section, sector, segment, sept, set, share, station, status, strain, stratum, subdivision, suborder, subspecies, title