15-letter words containing a, b, t, o, i
- upward mobility — movement from one social level to a higher one (upward mobility) or a lower one (downward mobility) as by changing jobs or marrying.
- urban migration — the process of people moving from rural areas to cities
- vegetable ivory — ivory (def 9).
- voltaic battery — battery (def 1a).
- weatherboarding — an early type of board used as a siding for a building.