Lexicalized representations of adjectives such as easy and easier are related, so that both lexicalized and phrasal comparatives would have the same feature structure; easier would have the feature structure  Encoding derivations in the lexicon could be applicable for languages with relatively unproductive derivational phenomena, but it certainly is not possible to represent in the grammar lexicon, 2 all derived forms as lexemes for an agglutinative language like Turkish.
one needs to incorporate such derivational processes in a principled way along with the computation of the effects on derivations on the representation of the semantic information.