speaking vs disputation

speaking and disputation both are nouns.

Word	Noun	Adjective	Verb	Adverb
speaking	Yes	Yes	No	No
disputation	Yes	No	No	No

As nouns, disputation is a hyponym of speaking; that is, disputation is a word with a more specific, narrower meaning than speaking:

speaking: delivering an address to a public audience
disputation: the formal presentation of a stated proposition and the opposition to it (usually followed by a vote)

Other hyponyms of speaking include reading, recital, recitation, debate, public debate.

speaking (noun)	disputation (noun)
delivering an address to a public audience	the formal presentation of a stated proposition and the opposition to it (usually followed by a vote)
the utterance of intelligible speech	a contentious speech act; a dispute where there is strong disagreement

speaking (adjective)	disputation (adjective)
capable of or involving speech or speaking
capable of speech