psychometrika vs psychometrics

psychometrika and psychometrics both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychometrika	Yes	No	No	No
psychometrics	Yes	No	No	No

As nouns, psychometrika and psychometrics are synonyms defined as:

psychometrika and psychometrics: any branch of psychology concerned with psychological measurements

Other synonyms of psychometrika include psychometry.

psychometrika (noun)	psychometrics (noun)
any branch of psychology concerned with psychological measurements	any branch of psychology concerned with psychological measurements