Gen or Gain: How To spell?

The word Gen is misspelled against Gain, a noun meaning "A square or beveled notch cut out of a girder, binding joist, or other timber which supports a floor beam, so as to receive the end of the floor beam."

Word contains consecutive vowels 'AI' in between alphabets g & n is misspelled as 'E'
Wrong Spelling: g-e-n
Correct Spelling: g-ai-n
Explore spell check of Gain to spell without errors.