How to store data with that have multiple changing characteristics?

Question

I have some data in the following format:

• Some keywords
• Multiple characteristics for every keyword that change over time, biweekly

I am looking for a way to store this data. I cannot use a normal table as there are multiple characteristics for each word, not just one.

Any help would be appreciated.

I tried creating different tables for each characteristic, so that each table would have the keywords, the date, and said characteristic for each keyword at that specific date, but I was wondering if there is a data structure where I can store all the characteristics in the same place, maybe something like a 3D data structure.