insect repellent vs insect repellant

insect repellent and insect repellant both are nouns.

Word	Noun	Adjective	Verb	Adverb
insect repellent	Yes	No	No	No
insect repellant	Yes	No	No	No

As nouns, insect repellent and insect repellant are synonyms defined as:

insect repellent and insect repellant: a chemical substance that repels insects

Other synonyms of insect repellent include insectifuge.

insect repellent (noun)	insect repellant (noun)
a chemical substance that repels insects	a chemical substance that repels insects