indicator vs chemical science

indicator and chemical science both are nouns.

Word	Noun	Adjective	Verb	Adverb
indicator	Yes	No	No	No
chemical science	Yes	No	No	No

indicator (noun)	chemical science (noun)
a device for showing the operating condition of some system	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
a signal for attracting attention
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction