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One can be made a synonym of the other. As postgres is a nickname, postgresql should be the master. There is a tag synonym suggestion here that can be voted on: gis.stackexchange.com/tags/postgresql/synonyms
This synonym was suggested three weeks ago and was merely awaiting moderator approval, which has been done. Tag synonyms may be suggested through the link at the bottom of the main site's tags page.
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postgres
is a nickname,postgresql
should be the master. There is a tag synonym suggestion here that can be voted on: gis.stackexchange.com/tags/postgresql/synonyms