11-letter words containing b, r, u, m
- untrembling — not trembling or shaking
- wave number — the number of waves in one centimeter of light in a given wavelength; the reciprocal of the wavelength.
- waved umber — a brownish geometrid moth, Menophra abruptaria, that is cryptically marked to merge with tree bark
- wurttemberg — a former state in SW Germany: now part of Baden-Württemberg.