\citation and \cite are synonyms
\nocitation and \nocite are synonyms

\cite and \nocite are traditional bibTeX usage (in LaTeX).

\nocitation (\nocite) is a hidden citation, i.e. it pulls an entry
from the dataset, including it in the bibliography list, but does not
render a reference in the text.

This is useful, for example, to force a reference tag at the place
where a table or figure is called, but to postpone the rendering of
the reference to the bibliography to figure later in the floated table
or figure.

\nocite does the same thing as \cite[none] [key]