Irregular Comparatives
Adjectives
The following four adjectives have an irregular comparative:
bueno - goodSuperlativemejor - better
malo - badSuperlativepeor - worse
grande - largeSuperlativemayor - larger, older
pequeño - smallSuperlative menor - smaller, younger
Más and menos are not used with the irregular comparatives.
Adverbs
The following four adverbs have also an irregular comparative:
mucho - muchSuperlativemás - more
poco - littleSuperlativemenos - less
bien - wellSuperlativemejor - better
mal - badlySuperlativepeor - worse