Yes, jar is a valid Scrabble word. JAR: vibrating with an impact [v JARRED, JARRING, JARS] Other definitions: Check the words in the Scrabble dictionary and make sure it is an official Scrabble word. Use this Scrabble dictionary checker to find out if a word is acceptable in your Scrabble dictionary®. When you enter a word and click the Check Dictionary button, it simply tells you if it is valid or not, and lists the dictionaries in the case of a valid word. In addition, you can also read the meaning if you want to know more about a particular word. Other words you can form with the same letters: raj and cheat solutions for all popular word games: words with friends, wordle, wordscapes and 100 others. WordNet ® Princeton University. wordnet.princeton.edu.