chemical science vs periodic table

chemical science and periodic table both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemical science	Yes	No	No	No
periodic table	Yes	No	No	No

chemical science (noun)	periodic table (noun)
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions	(chemistry) a tabular arrangement of the chemical elements according to atomic number as based on the periodic law