There are no specific words your toddler “should” know by 2 years old. But by this time, they will know many words, and they may start to use simple sentences—one of many new milestones to come. Their speech will become clearer and more coherent so that even strangers who aren’t familiar with their speaking patterns and made-up words will start to understand them when they talk.
If you believe your 2-year-old has speech delays, contact their healthcare provider, who may be able to pinpoint any possible causes or offer a 2-year-old speech checklist.