taxis vs chemotaxis

taxis and chemotaxis both are nouns.

Word	Noun	Adjective	Verb	Adverb
taxis	Yes	No	No	No
chemotaxis	Yes	No	No	No

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

taxis: a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism
chemotaxis: movement by a cell or organism in reaction to a chemical stimulus

taxis (noun)	chemotaxis (noun)
a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism	movement by a cell or organism in reaction to a chemical stimulus
the surgical procedure of manually restoring a displaced body part