Group 1

Group 2

Group 3

Group 4

Group 5

scissors

scales

gallows

barracks

hair (refers to strands of hair as entities)

rice (grains)

buckwheat (grains)

millet (grains)

beetroot (roots)

furniture (items)

dust (particles)

paraphernalia

crossroads

data

media

Your comments (for indicating whether you had difficulty in allocating some of the words, optional):  

swings and works don’t seem to fit in any of the groups: grammatically plural, but referring to several entities

water doesn’t fit either: grammatically singular but referring to a single entity