
This package provides the american-small dictionary, based on the americansml+ dictionary supplied with the source for ispell, with additional words added from the more comprehensive wamerican-small word list package.
This is smaller dictionary than the one installed by iamerican. Nothing prevents you installing both (and others) at the same time.
There are also -large, -huge, -insane, and standard versions of this dictionary, and there are ibritish* packages as well.
The package also suggests wamerican-small because ispell's (L)ookup command needs a word list.