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