Classification of words I Variable and invariable words Words can be classified according to their variability Variable words refer to those having different inflections, whereas invariable words refer to those having no inflective forms, e. g care look b efore careful looks rarely careless looking always carefulness looked or carelessness SInceClassification of Words Variable and invariable words Words can be classified according to their variability. Variable words refer to those having different inflections, whereas invariable words refer to those having no inflective forms, e.g. care look before careful looks rarely careless looking always carefulness looked for carelessness since