fraction vs chemical substance

fraction and chemical substance both are nouns.

Word	Noun	Adjective	Verb	Adverb
fraction	Yes	No	Yes	No
chemical substance	Yes	No	No	No

As nouns, chemical substance is a hypernym of fraction; that is, chemical substance is a word with a broader meaning than fraction:

fraction: a component of a mixture that has been separated by a fractional process
chemical substance: material produced by or used in a reaction involving changes in atoms or molecules

Other hypernyms of fraction include chemical.

fraction (noun)	chemical substance (noun)
a small part or item forming a piece of a whole	material produced by or used in a reaction involving changes in atoms or molecules
the quotient of two rational numbers
a component of a mixture that has been separated by a fractional process

fraction (verb)	chemical substance (verb)
perform a division