Having a set of related wordforms of a single word expressing various grammatical features by (usually systematic) modifications of the word, such as the Englis

Having a set of related wordforms of a single word expressing various grammatical features by (usually systematic) modifications of the word, such as the English 'work'->'worked', but on a much larger scale for most languages worldwide. See https://en.wikipedia.org/wiki/Inflection https://en.wikipedia.org/wiki/Inflection