I would say, that depends on your schema for the articles and news and how you create new ones.
If articles and news share the same columns (or the have most columns in common) you can use one table and just have a column that distinguishes between article and news.
For creating new entries: Do you have a single form in your backend where the author can decide wether the entry should be an article or a news entry?
If you have different forms because articles and news have different properties, you should consider to create separate tables.
Do you consider articles and news to be basically the same or do they have even different business logic?
Edit after comment:
I meant if you do something different with them like e.g. there is email notification if a new article is created. I assume you don't have that.
If they have the same properties, then there is no need to create an extra table.
Nevertheless, having two different tables might be a better choice if you make changes to your system in the future (e.g. one day you realize that you need other properties for articles that don't make sense for news).