The word Dreidnaught is misspelled against Dreadnaught, a noun meaning "A fearless person."
-->
Dreadnaught has vowels 'ea' together mispronounced as 'ei'
Word contains consecutive vowels 'EA' in between alphabets dr & dnaught is misspelled as 'EI'
Wrong Spelling:  dr-ei-dnaught 
Correct Spelling:  dr-ea-dnaught 
Check more misspelled words of Dreadnaught to spell it correct.