aerogramme vs aerogram

aerogramme and aerogram both are nouns.

Word	Noun	Adjective	Verb	Adverb
aerogramme	Yes	No	No	No
aerogram	Yes	No	No	No

As nouns, aerogramme and aerogram are synonyms defined as:

Other synonyms of aerogramme include air letter, airmail letter.

aerogramme (noun)	aerogram (noun)
a letter sent by air mail	a letter sent by air mail