WordDefiner is a little more than an open-source online English dictionary and thesaurus app. It returns the phonetic transcription, pronunciation audio, and meanings based on part(s) of speech for words you look up. Not just that, but you can also see similarly spelled, strongly associated, similar sounding, and even rhyming words.

The results are powered by dictionaryapi.dev and the Datamuse API (datamuse.com/api/)