ability vs science

ability and science both are nouns.

Word	Noun	Adjective	Verb	Adverb
ability	Yes	No	No	No
science	Yes	No	No	No

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

ability: possession of the qualities (especially mental qualities) required to do something or get something done
science: ability to produce solutions in some problem domain

ability (noun)	science (noun)
the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment	a particular branch of scientific knowledge
possession of the qualities (especially mental qualities) required to do something or get something done	ability to produce solutions in some problem domain