Classifying keywords into easily analyzed categories
I'm looking at the on-site keyword section of Google Analytics. In any given months, I have 10s of thousands of keywords typed by website visitors. I'm trying to determine if there's seasonality to these keywords. However, since they're user-defined, they're not consistent. Different people might type cardiology, heart, aorta, angio, etc, and it's helpful to know if there are trends for similar types of words.
I'm trying to avoid creating a table manually in Excel. Is there anything in Google Analytics or online that will provide a categorization schema (particularly for medical terminology) that I can apply to my keywords?