Wiktionary
subgroups
n. (plural of subgroup English)
Usage examples of "subgroups".
In 1921, Billy Ingram promoted his hamburgers to an American society whose many subgroups were still deeply entrenched in and divided by their original ethnic traditions.
Springbuck walked among the men of Erub and divided them into subgroups, selecting those he deemed most alert and aggressive-looking for leaders.
You can, if you like, subdivide this group into a fairly large number of subgroups, but why should you?