sphere vs artefact

sphere and artefact both are nouns.

Word	Noun	Adjective	Verb	Adverb
sphere	Yes	No	No	No
artefact	Yes	No	No	No

As nouns, artefact is a hypernym of sphere; that is, artefact is a word with a broader meaning than sphere:

Other hypernyms of sphere include artifact.

sphere (noun)	artefact (noun)
any spherically shaped artifact	a man-made object taken as a whole
a particular aspect of life or activity
the geographical area in which one nation is very influential
the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
a solid figure bounded by a spherical surface (including the space it encloses)
a three-dimensional closed surface such that every point on the surface is equidistant from the center
a particular environment or walk of life