I misunderstood indeed. @Bathinda, currently the only ways to create tags I think are now:
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From a topic creation or edition
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From the tag groups page
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From the synonym page
And you’d like to be able to create tags from /tags without having to create/edit a topic, create a tag group or a synonym.
I understand that 
This current topic was focused on synonyms and we added tags creation in this particular field, so I invite you to open a new Contribute > Feature topic if you want to propose such a feature 