different between pneumogram vs aerogram

English

pneumo- +? -gram

pneumogram (plural pneumograms)

(medicine) A record (often overnight) of the respiratory movements of a subject by the use of pneumography.

aero- +? -gram

aerogram (plural aerograms)

(dated) A wireless message.
(dated, rare) A telegram whose transmission included at least one segment sent via airplane.
A thin piece of foldable and gummed paper for writing a letter and serving as its own envelope for transit via airmail.
(medicine, rare) A pneumogram.

Borrowed from English aerogram.

aerogram n (plural aerogramen)

An aerogramme (thin piece of paper for transit via airmail).
Synonym: luchtpostblad

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