For an image, the term monochrome is usually taken to mean the same as black and white or, more likely, grayscale, but may also be used to refer to other combinations containing only tones of a single color, such as green-and-white or green-and-black.
Chinese has more native speakers than any other language, followed by Hindi and Urdu, which have the same linguistic origins in northern India. English comes next with 527 million native speakers. Arabic is used by nearly 100 million more native speakers than Spanish. The numbers are fascinating because they reflect the fact that two-thirds of the world's population share only 12 native languages.
This being said, it is worth noting that no Native American language actually makes it to the list of the top 25 spoken within the United States. The Navajo language, which is the most widely spoken Native American language in the US today, has only roughly 170 thousand speakers, with Hebrew just making it to the 25th spot on the list with close to 213 thousand speakers.