butyl nitrite vs isobutyl nitrite

butyl nitrite and isobutyl nitrite both are nouns.

Word	Noun	Adjective	Verb	Adverb
butyl nitrite	Yes	No	No	No
isobutyl nitrite	Yes	No	No	No

As nouns, butyl nitrite and isobutyl nitrite are synonyms defined as:

butyl nitrite and isobutyl nitrite: a colorless pungent liquid sometimes used as a stimulant drug by drug abusers

butyl nitrite (noun)	isobutyl nitrite (noun)
a colorless pungent liquid sometimes used as a stimulant drug by drug abusers	a colorless pungent liquid sometimes used as a stimulant drug by drug abusers