xenobiology

As nouns the difference between taxonomy and xenobiology

is that taxonomy is the science or the technique used to make a classification while xenobiology is the speculative biology of extraterrestrial life forms.

As nouns the difference between null and xenobiology

is that null is a non-existent or empty value or set of values while xenobiology is the speculative biology of extraterrestrial life forms.

As an adjective null

is having no validity, "null and void.

As a verb null

is to nullify; to annul.

As a noun xenobiology

is the speculative biology of extraterrestrial life forms.

As an adjective xenobiological is

of or pertaining to xenobiology.

As nouns the difference between xenobiology and xenobiologist

is that xenobiology is the speculative biology of extraterrestrial life forms while xenobiologist is a biologist who works in xenobiology.