good speller vs poor speller

good speller and poor speller both are nouns.

Word	Noun	Adjective	Verb	Adverb
good speller	Yes	No	No	No
poor speller	Yes	No	No	No

As nouns, good speller and poor speller are synonyms defined as:

Other synonyms of good speller include speller.

good speller (noun)	poor speller (noun)
someone who spells words	someone who spells words