Answer: groups

AnswerCrossword Clue
GROUPSRock bands, e.g.
GROUPSTour units
GROUPSPuts into categories
GROUPSMilitary units
GROUPSClutches
GROUPSAssemblages
GROUPSCategorizes
GROUPSFacebook users' multitude
groupsto form into a group
groupsnumber of persons, animals, or things considered together
groupsGROUP, to arrange in a group (a collection)