zip, n. [hissing], sibilance, sibilation.--v. [hiss], sibilate.
zone, n. clime, [region]; [girdle], [belt], [band], [girth].
Addenda
automobile, n. motor [car], autocar, motor. Associated words: garage, tonneau, carburetter, chassis, automobilist, chauffeur, [mechanician].
baby carriage. perambulator.
balloon, n. Montgolfier (hot-air balloon). Associated words: parachute, [inflate], [inflation], deflate, deflation, dirigible.
birth rate. natality.
blood poisoning. pyæmia.
blue, n. indigo.
books, n. pl. Associated words: literature, literary, bibliomaniac, bibliophagist, bibliotaph, bookcraft, bookworm.