2, 20-25, 20-30, 20's, 20s, 25-30, 30-35, 30-40, 30's, 30s, 35-40, accessory, adult, advancement, apparatus, apparel, assembly, associate, builder, building, challenging, clip board, clip-board, clothes, clothing, collaborating, colleague, color, colour, conference, constructing, cooperation, daylight, daytime, defending, demanding, earth, examining, excavation, exterior, eyeing, fellow, garment, gathering, gentleman, ground, group, guy, hard hat, hat, helmet, human, human being, looking, luminous-vest, machine, male, negative space, observing, outdoor, outside, person, safeguard, safety vest, safety-hat, safety-vest, security, seeing, soil, spectating, spectator, stone, team, thirties, thirty, three-quarter length, toiling, transit, transport, transporting, twenties, twenty, two, western european, white space, work, worker,
