biosystematy vs biosystematics

biosystematy and biosystematics both are nouns.

Word	Noun	Adjective	Verb	Adverb
biosystematy	Yes	No	No	No
biosystematics	Yes	No	No	No

As nouns, biosystematy and biosystematics are synonyms defined as:

biosystematy and biosystematics: use of data (e.g. cytogenetic or biochemical) to assess taxonomic relations especially within an evolutionary framework

biosystematy (noun)	biosystematics (noun)
use of data (e.g. cytogenetic or biochemical) to assess taxonomic relations especially within an evolutionary framework	use of data (e.g. cytogenetic or biochemical) to assess taxonomic relations especially within an evolutionary framework