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Perhaps you mean the comparative form: the comparative form of the adjective pretty is prettier. (The superlative form is prettiest, but comparative sounds more like cumulative.)
comparative - merrier superlative - merriest
"Older" is the comparative form of old. The superlative form is oldest.
Bitter is a comparative and a bittest is superlative
For the adjective "pretty" -- prettier is the comparative, and prettiest is the superlative.
Sweetie is a noun and does not have a comparative or superlative form.
Comparative: older Superlative: oldest
The comparative form of cloudy is "cloudier". The superlative form is "cloudiest".
"Larger" is the comparative form of large. The superlative form is largest.
The comparative form of easy is easier, and the superlative form is easiest.
The comparative form of gloomy is gloomier, the superlative form is gloomiest.
"Easier" is the comparative form of easy. The superlative form is easiest.