Find words that form other words when both -r (or -er) and -st (or -est) are added, e.g.

language/english/spelling/operations.on.words/er.est New

New entry, edited from material collected for the archive and not yet in a released version.

Find words that form other words when both -r (or -er) and -st (or
-est) are added, e.g. dive - diver - divest.

dive - diver - divest
conge - conger - congest
head - header - headrest (just kidding)

and a couple others that are just -er + -est:

conquer - conquest
infer - infest

-- Dave Mallick <DMALLICK@middlebury.edu>