dissemination vs spreading

dissemination and spreading both are nouns.

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

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

Other hypernyms of dissemination include spread.

As nouns, dissemination and spreading are synonyms defined as:

dissemination and spreading: the opening of a subject to widespread discussion and debate

Other synonyms of dissemination include airing, public exposure.

dissemination (noun)	spreading (noun)
the act of dispersing or diffusing something	act of extending over a wider scope or expanse of space or time
the property of being diffused or dispersed	the opening of a subject to widespread discussion and debate
the opening of a subject to widespread discussion and debate	process or result of distributing or extending over a wide expanse of space