noun
a person who is in favor of something or someone
adjective
relating to or characteristic of someone who supports a particular person, group, or cause
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The political candidate gained a large number of supporters during the campaign.
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I'm a huge supporter of that band, I've been to all their concerts.
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She's a ride-or-die supporter of that sports team.
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The pillar of the community was seen as a strong supporter of local businesses.