Merriam-Webster is America’s foremost publisher of language-related reference works. The company publishes a diverse array of print and electronic products, including Merriam-Webster’s Collegiate Dictionary, Eleventh Edition—America’s best-selling desk dictionary—and Webster’s Third New International Dictionary, Unabridged. These online dictionaries also give us the spoken pronountiation of each word.
I have found the dictionary -I have used both the monolingual and the bilingual (which translates the word or expression from Spanish into English)- quite complete since, in the case of the monolingual, it gives you synonims, definitions and also you can click on the words to listen to their pronunciation -what you cannot do in most online dictionaries-. In the case of the bilingual dictionary, I do not think it is really useful for us because we can clearly see that it is thought for learners of Spanish. Anyway, you enter a word in Spanish and the dictionary gives you synonims of the word. However, I think it is not very accurate because it does not say in which context each is used. Let’s see an example:
If wee write the word casa, we get: