Install iamerican by entering the following commands in the terminal:
sudo apt update sudo apt install iamerican
Description:
American English dictionary for ispell (standard version)
This package provides the standard, medium-sized American English dictionary, based on the americanmed+ dictionary supplied with the source for ispell, with additional words added from the more comprehensive wamerican word list package. . There are also -small, -large, -huge, and -insane versions of this dictionary, and there are ibritish* packages as well. . The package also suggests wamerican because ispell's (L)ookup command needs a word list.
Homepage: http://www.lasr.cs.ucla.edu/geoff/ispell.html
Version: 3.4.00-6
Section: universe/text