It's common to see Microsoft Word to be listed on job postings. This type of skill seems somewhat arbitrary and broad, and depends on industry - expectations from graphic designer would be different from a journalist.
However, job postings never mention concrete expectations. Hence I want to know what would be the minimum level where you can confidently put such skill on resume. I find it questionable and uncomfortable to put MS Word on resume, especially if most of the time your experience is via college and high school papers, where most of the time Times New Roman, 12 points, double spaced format is used.
With programming languages, I can at least provide a portfolio of my work ( on github or elsewhere) to backup my claim.While I know there exists certification for MS Office, and that certainly backs up the claim that you have MS Word as skill, the certification costs and may be somewhat superfluous for someone going into IT or engineering, where technical certification is more valuable.
In short, what is the concrete minimum level at which I can put on my resume "Yes, I have MS Word as skill" ?