Meanings
Usage patterns
スーパーで買い物をするto do one's shopping at the supermarket
I plan to do some shopping at the supermarket on my way home.
スーパーを付けるto add subtitles/captions (to a broadcast)
Programs aimed at foreign viewers often have subtitles added.
〈物〉をスーパーで買うto buy something at the supermarket
I bought some milk at the supermarket.