Verbs can be conjugated to past/future tenses. Nouns can be pluralized. Adjectives also have comparative and superlative forms. For example fast, faster, and fastest.
What is the word that describes converting between the base form and the comparative and superlative forms?
X), comparative (X-er, with monosyllabic words, and some disyllables), and superlative (theX-est, with the same words). But even that's breaking up now, and only works with a small minority of short common adjectives. Syntax is taking over. – John Lawler Sep 19 '15 at 22:43