spell vs speller

spell and speller both are nouns.

Word	Noun	Adjective	Verb	Adverb
spell	Yes	No	Yes	No
speller	Yes	No	No	No

spell (noun)	speller (noun)
a verbal formula believed to have magical force	an introductory textbook to teach spelling
a psychological state induced by (or as if induced by) a magical incantation	someone who spells words
a time period for working (after which you will be relieved by someone else)
a period of indeterminate length (usually short) marked by some action or condition

spell (verb)	speller (verb)
take turns working
orally recite the letters of or give the spelling of
indicate or signify
place under a spell
write or name the letters that comprise the conventionally accepted form of (a word or part of a word)
relieve (someone) from work by taking a turn