How to turn multiple word documents into one pdf easily?

I’ve got six separate Word documents that need to become one PDF for a portal that only accepts a single file under 10 MB. Is there an easy way to merge them?

had the same thing last month with some planner pages. i just opened a new word doc and copied each one in order then saved as pdf from the file menu. that kept it under 10mb for me tbh. if they have images it might get big so i compress pics in word first sometimes.