Adjectives are an important part of speech. They usually describe a person or thing. They tell us what somebody or something is like.
richer, more exciting
richest, most exciting
The Superlative Comparative Song
My cute dog is cuter than your ugly dog...
the Russian winter, a Shakespearean sonnet
beautiful, long, dark brown
rather hot, hot, very hot; hot, hotter, the hottest
See also nouns as adjectives
coffee cup, bus station, research centre