pretty vs middling

pretty is not a noun while middling is a noun.

Word	Noun	Adjective	Verb	Adverb
pretty	No	Yes	No	Yes
middling	Yes	Yes	No	Yes

As adverbs, pretty and middling are synonyms defined as:

Other synonyms of pretty include fairly, jolly, moderately, passably, reasonably, somewhat.

pretty (noun)	middling (noun)
	any commodity of intermediate quality or size (especially when coarse particles of ground wheat are mixed with bran)

pretty (adjective)	middling (adjective)
(used ironically) unexpectedly bad	lacking exceptional quality or ability
pleasing by delicacy or grace; not imposing

pretty (adverb)	middling (adverb)
to certain extent or degree	to certain extent or degree