The best replacement for mediums is media.

The best alternatives to mediums are rated as following:
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★★★★  psychics
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Speaking about mediums, one probably shouldn't forget about oil paints.

Other search terms related to mediums and their ratings are:
★★★★★ oil paints
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Scale is based on the average worldwide traffic of mediums in all years. Click on graph for more.
mediums
media
psychics