Greans or Grains: How To spell?

The word Greans 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 'EA'
Wrong Spelling:  gr-ea-ns 
Correct Spelling:  gr-ai-ns 
Explore spell check of Grains to spell without errors.

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