Aviation.
The second most common word is 'be'
The second most common vowel in the English language is 'I'. The most common vowel is 'E'.
Christianity is the second most common religion in Africa, with Islam being the most common.
Arabic is the second most common spoken language after Chinese. Hindi is number three, and English is the fourth most common.
Carnivores are the second most common order of mammals, ungulates being the first.
Hydrogen is the most common element in the universe, not oxygen.Oxygen is the most common element on Earth, followed by silicone.
nursing homes
The second most common language spoken in Alaska is Spanish.
Glycerol, the most common and important By product of soap industry.
Spanish is the second most common "spoken" language. The second most common language is sign language.
The tobacco industry is the second largest purchaser of chocolate to the foodservice industry.
Hydrogen, helium.