Formal:
* Commend: To praise formally or officially.
* Extol: To praise highly.
* Eulogize: To praise highly, especially in a formal speech or written tribute.
* Encomium: A formal expression of high praise.
* Laude: To praise highly.
* Exalt: To praise highly; to elevate in rank, power, or importance.
Informal:
* Praise: To express approval or admiration for someone or something.
* Compliment: To express admiration or approval, often in a polite way.
* Applaud: To show approval or appreciation by clapping.
* Celebrate: To mark a special occasion with festivities.
* Cherish: To hold dear; to value highly.
* Admire: To regard with respect or approval.
The best antonym for "disparage" will depend on the specific context.