isobutyl nitrite vs butyl nitrite

isobutyl nitrite and butyl nitrite both are nouns.

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

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

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

isobutyl nitrite (noun)	butyl 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