The word Iritant is misspelled against Irritant, a noun meaning "A poison that produces inflammation."
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Irritant has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings i & itant which should not be misspelled with single 'R'
Wrong Spelling:  i-r-itant 
Correct Spelling:  i-rr-itant 
Find more wrongly spelled words of Irritant to spell it well.