'Coronavirus' represents a family of viruses.
The specific one from this family that triggered the Wuhan outbreak was given a temporary name: '2019-nCoV'.
Later given a permanent name: 'SARS-CoV-2'.
'COVID 19' is the name of the disease caused by this virus.
who.int/health-topics/…
"COVID-19 is the infectious disease caused by the most recently discovered coronavirus. This new virus and disease were unknown before the outbreak began in Wuhan, China, in Dec'19."