Are there any websites or games where I can use my own vocabulary words than the random words they give u?

Like say if I want to use the words hypertext or embellish, I just put it in some engine and it may give me the definition with choosing a,b, or c etc, things like that. I get bored just looking in the dictionary and using flashcards all the time. Has to be online too please and thank you. I'm a college student btw.