Word not found in any official scrabble dictionaries.
"Imo" Definition
noun
In Japan, a generic name for edible roots, such as yams, potatoes, sweet-potatoes, and taro. Used alone without a qualifying prefix, it is especially applied in Japan and in Korea to the taro, Caladium Colocasia, which is also called in Japan sato-imo. See Colocasia, taro, and gabi.
Source: Century Dictionary
abbreviation
International Maritime Organization.
Source: Merriam-Webster
residual
International Maritime Organization.
Source: Oxford Dictionary
In my opinion:.
Source: Oxford Dictionary