The word Ferugineous is misspelled against Ferrugineous, an adjective meaning "Ferruginous."
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Ferrugineous has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings fe & ugineous which should not be misspelled with single 'R'
Wrong Spelling: fe-r-ugineous
Correct Spelling: fe-rr-ugineous
Check more misspelled words of Ferrugineous to spell it correct.