The comparative form of "pretty" is "prettier," and the superlative form is "prettiest." These forms are used to compare the attractiveness of two or more subjects. For example, you might say, "She is prettier than her sister," or "She is the prettiest girl in the class."
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
The comparative form of cloudy is "cloudier". The superlative form is "cloudiest".
"Older" is the comparative form of old. The superlative form is oldest.
"Bit" is a noun and a verb and, as such, does not have a comparative or superlative form.
The comparative is grumpier and the superlative is grumpiest.
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
well (healthy) comparative is better and superlative is the best
The comparative form of easy is easier, and the superlative form is easiest.
"Easier" is the comparative form of easy. The superlative form is easiest.