spell

As nouns the difference between spell and spellbook

is that spell is (obsolete) speech, discourse or spell can be (dialectal) a splinter, usually of wood; a spelk or spell can be a shift (of work); a set of workers responsible for a specific turn of labour while spellbook is a book of magic spells.

As a verb spell

is (obsolete) to speak, to declaim or spell can be (obsolete) to read (something) as though letter by letter; to peruse slowly or with effort or spell can be to work in place of (someone).

As a noun spell

is (obsolete) speech, discourse or spell can be (dialectal) a splinter, usually of wood; a spelk or spell can be a shift (of work); a set of workers responsible for a specific turn of labour.

As a verb spell

is (obsolete) to speak, to declaim or spell can be (obsolete) to read (something) as though letter by letter; to peruse slowly or with effort or spell can be to work in place of (someone).

As an adjective unspellable is

difficult or impossible to spell.