valedictorian

As nouns the difference between valedictorian and commencement

is that valedictorian is (us|canada|properly) the individual in a graduating class who delivers the farewell or valedictory address, usually the person who graduates with the highest grades while commencement is the first existence of anything; act or fact of commencing; rise; origin; beginning; start.

As nouns the difference between valedictorian and dropout

is that valedictorian is (us|canada|properly) the individual in a graduating class who delivers the farewell or valedictory address, usually the person who graduates with the highest grades while dropout is someone who has left an educational institution without completing the course.

As nouns the difference between valedictorian and drop

is that valedictorian is (us|canada|properly) the individual in a graduating class who delivers the farewell or valedictory address, usually the person who graduates with the highest grades while drop is a small mass of liquid just large enough to hold its own weight via surface tension, usually one that falls from a source of liquid.

As a verb drop is

to fall in droplets (of a liquid).

Solutatorian is likely misspelled.

Solutatorian has no English definition.

As a noun valedictorian

is the individual in a graduating class who delivers the farewell or valedictory address, usually the person who graduates with the highest grades.

As nouns the difference between valedictorian and covaledictorian

is that valedictorian is (us|canada|properly) the individual in a graduating class who delivers the farewell or valedictory address, usually the person who graduates with the highest grades while covaledictorian is a graduating student who shares the position of valedictorian with another student.