Alar vs chemical substance

Alar and chemical substance both are nouns.

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

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

Alar: a chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time
chemical substance: material produced by or used in a reaction involving changes in atoms or molecules

Other hypernyms of Alar include chemical.

Alar (noun)	chemical substance (noun)
a chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time	material produced by or used in a reaction involving changes in atoms or molecules