The word Dros is misspelled against Dross, a noun meaning "Rust of metals."
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Dross has double 'ss' in the end mispronounced as 's'
Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  dro-s 
Correct Spelling:  dro-ss 
Find more incorrect spellings of Dross to spell right way.