oral presentation vs public speaking

oral presentation and public speaking both are nouns.

Word	Noun	Adjective	Verb	Adverb
oral presentation	Yes	No	No	No
public speaking	Yes	No	No	No

As nouns, oral presentation and public speaking are synonyms defined as:

oral presentation and public speaking: delivering an address to a public audience

Other synonyms of oral presentation include speaking, speechmaking.

oral presentation (noun)	public speaking (noun)
delivering an address to a public audience	delivering an address to a public audience