The word Survyillants is misspelled against Surveillants, which is plural of "Surveillant"
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Word contains consecutive vowels 'EI' in between alphabets surv & llants is misspelled as 'YI'
Wrong Spelling:  surv-yi-llants 
Correct Spelling:  surv-ei-llants 
Check more misspelled words of Surveillants to spell it correct.