"Kudos," "well-done," and other words of praise are forms of congratulations, or an expression of approval and acclaim.

Congratulations are expressed for good wishes on a special occasion, not just an accomplishment. For example, you wouldn't tell someone who just had a baby, "Good job on your accomplishment," but you would say, "Congratulations!" If, however, someone says "congratulations!" when you drop your ice cream cone or get a bad grade on your math test, they're probably being sarcastic.

Definitions of congratulations

n an expression of approval and commendation

extolment, kudos, praise
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an exaggerated expression (usually of praise)
encomium, eulogy, paean, panegyric, pean
a formal expression of praise
eulogium, eulogy
a formal expression of praise for someone who has died recently
good word, recommendation, testimonial
something that recommends (or expresses commendation of) a person or thing as worthy or desirable
a remark (or act) expressing praise and admiration
character, character reference, reference
a formal recommendation by a former employer to a potential future employer describing the person's qualifications and dependability
exaggerated praise (as for promotional purposes)
a compliment that I heard about you that I offer to trade for a compliment you have heard about me
excessive or insincere praise
fulsomeness, smarm, unction
excessive but superficial compliments given with affected charm
Type of:
approval, commendation
a message expressing a favorable opinion

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