how do you say "welcome'' and ''congratulations'' in spanish?

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Welcome= bienvenido (male), & bienvenida (female)
congratulations= "felicidades" or "felicitaciones"

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Hi i can answer your question; welcome mean (BIENVENIDO) and congratulations mean (FELICITACIONES)

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Wellcome=Bienvenido/a
Congratulation=Enhorabuena o felicitaciones, felicidades
Enhorabuena is more formal and polite

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"como se dice " y "felicitaciones"

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Congratulations! = Felicidades!, Felicitaciones!
Wellcome =  (singular) Bienvenido/a, (plural) Bienvenidos (as)

The prase: "You're wellcome" = de nada, es un placer