Ider or Aider: How To spell?

The word Ider is misspelled against Aider, a noun meaning "One who, or that which, aids."

Word begins with consecutive vowels 'AI' followed by alphabets 'der' is misspelled as 'I'
Wrong Spelling:  i-der 
Correct Spelling:  ai-der 
Explore spell check of Aider to spell without errors.

You might be interested to know

Oguillette or Aiguillette?

Umer or Aimer?

Yrless or Airless?