Suborder \Sub*or"der\, n. (Nat. Hist.) A division of an order; a group of genera of a little lower rank than an order and of greater importance than a tribe or family; as, cichoraceous plants form a suborder of Compositae. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

55 Moby Thesaurus words for "suborder": biotype, blood, bracket, branch, caste, category, clan, class, division, estate, family, genotype, genus, grade, group, grouping, head, heading, kin, kingdom, label, level, order, phylum, pigeonhole, position, predicament, race, rank, rating, rubric, section, sept, series, set, species, station, status, strain, stratum, subclass, subdivision, subfamily, subgenus, subgroup, subkingdom, subspecies, subtribe, superclass, superfamily, superorder, superspecies, title, tribe, variety

Source: Moby Thesaurus II by Grady Ward, 1.0
 

suborder

Source: WordNet (r) 2.0
 

Suborder \Sub*or"der\, n. (Nat. Hist.) A division of an order; a group of genera of a little lower rank than an order and of greater importance than a tribe or family; as, cichoraceous plants form a suborder of Composit[ae].

Source: Webster's Revised Unabridged Dictionary (1913)