Guided topic modeling: generating words from topics

Question

I need to generate lists of words related to specific topics for a project. I am familiar with clustering methods of topic modeling such as LDA, but I have something else in mind. Are there any methods to generate lists of related words from a root word? For instance, where I could type "medicine" and it would return a list of words or terms related to medicine, such as "doctor", "malpractice", "office", etc.?