insect repellant vs insect repellent

insect repellant and insect repellent both are nouns.

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

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

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

Other synonyms of insect repellant include insectifuge.

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