spreading vs transmission

spreading and transmission both are nouns.

Word	Noun	Adjective	Verb	Adverb
spreading	Yes	No	No	No
transmission	Yes	No	No	No

As nouns, transmission is a hypernym of spreading; that is, transmission is a word with a broader meaning than spreading:

spreading (noun)	transmission (noun)
act of extending over a wider scope or expanse of space or time	the act of sending a message; causing a message to be transmitted
the opening of a subject to widespread discussion and debate	the gears that transmit power from an automobile engine via the driveshaft to the live axle
process or result of distributing or extending over a wide expanse of space	communication by means of transmitted signals
	an incident in which an infectious disease is transmitted
	the fraction of radiant energy that passes through a substance