system vs tract

system and tract both are nouns.

Word	Noun	Adjective	Verb	Adverb
system	Yes	No	No	No
tract	Yes	No	No	No

As nouns, tract is a hyponym of system; that is, tract is a word with a more specific, narrower meaning than system:

system (noun)	tract (noun)
instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity	a bundle of myelinated nerve fibers following a path through the brain
an ordered manner; orderliness by virtue of being methodical and well organized	a system of body parts that together serve some particular purpose
a group of physiologically or anatomically related organs or parts	a brief treatise on a subject of interest; published in the form of a booklet
the living body considered as made up of interdependent components forming a unified whole	an extended area of land
a complex of methods or rules governing behavior
a procedure or process for obtaining an objective
an organized structure for arranging or classifying
a group of independent but interrelated elements comprising a unified whole
(physical chemistry) a sample of matter in which substances in different phases are in equilibrium