WordWeb
WordWeb works like a dictionary tool that comes with features you would expect in any dictionary. Select a word from any application and then press a keyboard shortcut to find its meaning in WordWeb. In case you need synonyms, related terms, etc, just click on the appropriate tab and you're done. The Pro version includes some other capabilities, although the free version may be more than enough for your needs. WordWeb can look up words in seconds and provides you with a lot of useful related information. WordWeb is free for 30 days and stays free—provided you meet the company's environmental requirements. In short, you can continue to use WordWeb for free if you take two or fewer commercial flights per year. More than that and you need to buy the $19 Pro version of the software.
When WordWeb shows you a word, you not only see the definition but also get the text pronunciation, audio pronunciation and then more information that makes this software a lover's dream enjoy crossword puzzles – synonyms, analogies, word associations on dictionary sites such as Wiktionary (and Wikipedia so you can see the word in better context) and nouns, verbs related words, adverbs and adjectives. WordWeb is a website where you can view the word's definition and related information online. So you can link to words you want to remember, as well as use the service if you happen to be on someone else's computer.
Website: https://wordweb.info/