Install iamerican-huge by entering the following commands in the terminal:
sudo apt update sudo apt install iamerican-huge
Description:
American English dictionary for ispell (huge)
This package provides the american-huge dictionary, based on the americanxlg+ dictionary supplied with the source for ispell, with additional words added from the more comprehensive wamerican-huge word list package. . This is an even larger dictionary than the one installed by iamerican-large. Nothing prevents you installing both (and others) at the same time. . There are also -small, -large, -insane, and standard versions of this dictionary, and there are ibritish* packages as well. . The package also suggests wamerican-huge 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