Such a person is called the commencement speaker, and is usually a well known figure either locally, nationally or internationally, depending on the size and prestige of the institution. The commencement speech, or commencement address, is not to be confused with the valedictory address, given by the valedictorian, an outstanding member of the graduating class.
A person who gives unwanted advice is usually called a kibitzer.
If the person is paid for the advice, she/he is a counselor or personal coach. If the person gives unsolicited advice and is not paid, she/he is called a nuisance.
Gives is a verb. It's the third person singular conjugation of give.
The person who gives hearing test is called as an Audiologist. In Art of Hearing the audiologists are skilled at using a range of techniques and equipment to assess hearing health. Also provides free hearing check for adults.
it gives the listener something to relate to
The person who gives a speech is called a speaker or an orator. They are responsible for delivering a message or addressing a topic to an audience.
An orator is a person who gives a speech
Typically, a notable guest speaker such as a professor, academic, or public figure is invited to give a commencement speech at a graduation ceremony. Additionally, the valedictorian of the graduating class may give a speech reflecting on their time in school and looking towards the future.
congressanale
This is called the Inaugural Address, and historically has set the tone for the policies of the individual president.
This is called personification, or sometimes anthropomorphism.
A person who gives a statement is called a witness.
The Valedictorian. I was the one in my high school class of '83.
This is called a prologue.
SONA (State Of the Nation Address)
Host
A person who feels danger and gives warning is typically called an "alarmer" or "alarms someone".