unit vs artifact

unit and artifact both are nouns.

Word	Noun	Adjective	Verb	Adverb
unit	Yes	No	No	No
artifact	Yes	No	No	No

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

unit (noun)	artifact (noun)
an assemblage of parts that is regarded as a single entity	a man-made object taken as a whole
a single undivided whole
an organization regarded as part of a larger social group
a single undivided natural thing occurring in the composition of something else
any division of quantity accepted as a standard of measurement or exchange
an individual or group or structure or other entity regarded as a structural or functional constituent of a whole