what is the superlative adjectives?

A superlative adjective compares three or more nouns. This takes the comparison of nouns to the highest degree. An example would be: “My mother’s cooking is the best.” The rules for making superlative adjectives are almost identical to the rules for making comparative adjectives. They are:

• One syllable words - add “est” to the word. Remember that it is sometimes necessary to double the final consonant. Examples are: strong to strongest and big to biggest.
• One syllable words ending with an “e” - only add “st” like fine to finest or rare to rarest.  
• Two syllable words ending with a “y” - change the “y” to an “i” and add “est.” Two examples are crazy to craziest and silly to silliest.  
• Two and three syllable words - use “most” or “least.” Examples include most desirable and least expensive.