dissemination vs transmission

dissemination and transmission both are nouns.

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

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

dissemination (noun)	transmission (noun)
the act of dispersing or diffusing something	the act of sending a message; causing a message to be transmitted
the property of being diffused or dispersed	the gears that transmit power from an automobile engine via the driveshaft to the live axle
the opening of a subject to widespread discussion and debate	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