Greins or Grains: How To spell?

The word Greins is misspelled against Grains, a noun meaning "Pigeon's dung used in tanning. See Grainer. n., 1."

Word contains consecutive vowels 'AI' in between alphabets gr & ns is misspelled as 'EI'
Wrong Spelling:  gr-ei-ns 
Correct Spelling:  gr-ai-ns 
Find more wrongly spelled words of Grains to spell it well.

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