congratulatory address; congratulatory speech
A formal speech given at ceremonies, weddings, or official events to express congratulations.
I gave a congratulatory address at the wedding.
The company president delivered a New Year's congratulatory speech.
The principal delivered a congratulatory address at the graduation ceremony.
We are deeply honored to have received a congratulatory address from the mayor.
We received a congratulatory address from our former teacher at the wedding.
He read out the congratulatory address while looking at his script.
祝辞 is a congratulatory speech given to celebrate an occasion, whereas 式辞 is the broader formal ceremonial address that need not be purely congratulatory.
祝辞 is a speech of congratulation given at happy occasions, while 弔辞 is a eulogy of condolence given at funerals.
祝辞（しゅくじ）is a formal congratulatory speech at a ceremony, while 祝詞（しゅくし）is a more general term for congratulatory words or messages and looks/sounds almost identical.
祝辞 is a formal congratulatory speech given at a ceremony, not the celebration or gift itself that 祝い refers to.
祝辞 is a specific congratulatory speech given at a ceremony, while 祝福 is the broader act or feeling of blessing/well-wishing.
祝 (celebrate, congratulate) + 辞 (words, speech). A straightforward kanji compound meaning 'congratulatory speech'.