What's the difference between speller and spuller?

Speller

Definition:

(n.) One who spells.
(n.) A spelling book.

Example Sentences:

(1) EEG evoked potentials were studied in 23 young adolescent poor spellers and 21 controls.
(2) Significant effects were obtained for spelling ability, print size (same or different), and letter case (same or different), and the interaction of size X case, providing evidence for the use of visual memory by both good and poor spellers in learning to spell words.
(3) Good spellers were equally able to identify matched and mismatched pairs, while poor spellers showed greater difficulty in identifying mismatches than matches, supporting Frith's (1980) "partial cues" explanation of poor spelling performance.
(4) Findings typical of poor spellers were long auditory evoked potential (AEP) latencies and low amplitudes of early AEP deflections.
(5) David Speller, a Derbyshire poultry farmer who spoke at the NFU conference, says he is already finding it difficult to recruit staff.
(6) Generally, poor spellers seem to have problems with the early filtering processes of of attention, whereas spelling errors concerning the word as a whole seem to be associated with problems of late attentional processes.
(7) At both the elementary school (Grades 3 and 4) and undergraduate levels, good spellers spelled words more quickly than poor spellers.
(8) Twenty-three poor spellers (average age 13 years) and 21 matched controls were studied.
(9) The abnormal findings in the poor spellers are interpreted in terms of a brain maturational delay that presents as an attentional disorder.
(10) However, the data from the recognition task suggested that poor spellers may rely more on visual information than good spellers.
(11) Within each reading group, low spellers produced more semiphonetic errors than high spellers, and high spellers produced more phonetic errors than low spellers.
(12) Results produced with the paradigms were consistent with the claims that skilled spellers make use of both strategies and that the lexical strategy is more useful than the rule strategy.
(13) In poor spellers higher Mobility local correlation indices (LCIs) occurred in the right fronto-central derivation during reading.
(14) Compared with the "gold standard" of sentences containing key facts as chosen by the experts, a semiautomated method using a nonmedical speller to identify key words and phrases in context functioned with a sensitivity of 79%, i.e., approximately 8 in 10 key sentences were detected as the basis for PROLOG, rules and facts for the knowledge base.
(15) Four groups distinct in terms of English reading comprehension and spelling skills were identified among 141 Japanese college students: 5 good readers and spellers, 6 good readers but poor spellers, 3 poor readers but good spellers, and 4 poor readers and poor spellers.
(16) Moreover, significantly more right hemisphere dominant Mobility LCIs were seen in the fronto-central regions during reading in poor spellers as well as in the groupings of prepubertal boys and neonatal risk cases.
(17) Selective and sustained visual attention were tested in 29 boys with developmental dyslexia and 28 normal spellers (also boys) matched for age, grade in school, I.Q.
(18) In an attempt to determine whether educably mentally retarded children hold the same attitudes towards members of their group that nonretarded children hold, regular-class and special-education class students in junior high school indicated their trait perceptions of and willingness to interact with same-sex target children who were either competent or incompetent spellers and who were labeled as either regular-class or special-class students.
(19) I think Brexit may go two different ways for two different types of companies,” Speller says.
(20) Good and poor spellers in grades 3 through 6 spelled words and nonwords that differed in the types of information (phonological, orthographic, morphological, or visual) that could be used to produce their correct spelling.