 Application of a pattern different from the one that has been used historically can give rise to a new word, such as "older" replacing "elder" (where "older" follows the normal pattern of adjectival superlatives) and "cows" replacing "kine" (where "cows" fits the regular pattern of plural formation).In the 19th century, philologists devised a now classic classification of languages according to their morphology.Some languages are isolating, and have little to no morphology; others are agglutinative whose words tend to have lots of easily separable morphemes; others yet are inflectional or fusional because their inflectional morphemes are "fused" together.