I had previously been using Kahoot as a way to review, but with a group of sixth graders who came through I used it to teach vocabulary. The students came through for 30 minutes to see what Spanish will be like before they make a course selection for 7th grade and I wanted to keep this as much as possible in Spanish without it feeling like a "lesson" because there would not be any immediate follow up. It worked beautifully, as I chose lots of cognates and have the visual aids. I was also able to talk about numbers and include culture through the visuals I picked. In between rounds I was able to use the correct answers and incorrect answers as brief, but useful teaching moments. I would definitely consider it as a way to vary how to making introducing vocabulary more fun! If you don't have a 1:1 environment, kids could form teams and still play. Kahoot will run off or any computer or mobile device.
If you are trying to build in more Common Core connections into your curriculum via your questioning, I highly recommend checking out Martina Bex's CCSS Aligned L2 Reading Comprehension Questions guide which is free on her website. I have found it very helpful as I work to vary the types of reading comprehension questions I ask students. When we play Kahoot, I tend to keep almost all of the questions in Spanish, rather than using English. For assessments, I use a mixture of both. http://martinabex.com/2014/05/09/ccss-aligned-l2-reading-comprehension-questions/