https://www.wordsapi.comUse it to find definitions for more than 150,000 words. Try some:
inevitable
ascendancy
boastful
It's A Thesaurus
You can find synonyms, antonyms, or similar words. Try some:
fast
warm
violet
It's Much, Much More
Words API includes hierarchical information, such as knowing that:
a hatchback is a type of car
a finger is a part of a hand
oxygen is a substance of water