Which word should i use, whether aeroplane or airplane? what is the meaning of these words else what is the difference between two if there?
P.S: please correct if my question is wrong or inappropriate to this site.
The ngram answers your question nicely:
Aeroplane is an old form on the decline. It's not wrong but it's becoming obsolete fast. You'd likely use it to WWI era aeroplanes but you wouldn't call a jet fighter an aeroplane - currently it's almost exclusively an airplane.