The word Sterer is misspelled against Steerer, a noun meaning "One who steers; as, a boat steerer."
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Steerer has double "ee" is mispronounced as "e"
Remember double 'EE' in between the strings St & rer which should not be misspelled with single 'E'
Wrong Spelling:  St-e-rer 
Correct Spelling:  St-ee-rer 
Explore spell check of Steerer to spell without errors.