clean vs neaten

clean is a noun but neaten is not a noun.

Word	Noun	Adjective	Verb	Adverb
clean	Yes	Yes	Yes	Yes
neaten	No	No	Yes	No

As verbs, neaten is a hypernym of clean; that is, neaten is a word with a broader meaning than clean:

Other hypernyms of clean include groom.

As verbs, neaten is a hypernym of clean; that is, neaten is a word with a broader meaning than clean:

Other hypernyms of clean include clean up, square away, straighten, straighten out, tidy, tidy up.

clean (noun)	neaten (noun)
a weightlift in which the barbell is lifted to shoulder height and then jerked overhead

clean (adjective)	neaten (adjective)
free from dirt or impurities; or having clean habits
(of behavior or especially language) free from objectionable elements; fit for all observers
not spreading pollution or contamination; especially radioactive contamination
ritually clean or pure
free from clumsiness; precisely or deftly executed
free from sepsis or infection
thorough and without qualification
without difficulties or problems
(of a surface) not written or printed on
exhibiting or calling for sportsmanship or fair play
(of a manuscript) having few alterations or corrections
morally pure
(of a record) having no marks of discredit or offense
free from impurities
free of drugs
not carrying concealed weapons
free of restrictions or qualifications
(of sound or color) free from anything that dulls or dims

clean (verb)	neaten (verb)
clean one's body or parts thereof, as by washing	care for one's external appearance
remove unwanted substances from	put (things or places) in order
remove unwanted substances from, such as feathers or pits
remove shells or husks from
make clean by removing dirt, filth, or unwanted substances from
clean and tidy up the house
remove while making clean
remove all contents or possession from, or empty completely
deprive wholly of money in a gambling game, robbery, etc.
be cleanable

clean (adverb)	neaten (adverb)
in conformity with the rules or laws and without fraud or cheating
completely; used as intensifiers