We don't have synonyms for metaphysicks yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are metaphysical, metaphysics and metaphysis.
(n) :
Obsolete form of metaphysics. [(philosophy, uncountable) The branch of philosophy which studies fundamental principles intended to describe or explain all that is, and which are not themselves explained by anything more fundamental; the study of first principles; the study of being insofar as it is being (Latin: ens in quantum ens).]
(n) :
Obsolete form of metaphysics. [(philosophy, uncountable) The branch of philosophy which studies fundamental principles intended to describe or explain all that is, and which are not themselves explained by anything more fundamental; the study of first principles; the study of being insofar as it is being (Latin: ens in quantum ens).]