pentylenetetrazol vs pentamethylenetetrazol

pentylenetetrazol and pentamethylenetetrazol both are nouns.

Word	Noun	Adjective	Verb	Adverb
pentylenetetrazol	Yes	No	No	No
pentamethylenetetrazol	Yes	No	No	No

As nouns, pentylenetetrazol and pentamethylenetetrazol are synonyms defined as:

pentylenetetrazol and pentamethylenetetrazol: a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark

Other synonyms of pentylenetetrazol include Metrazol.

pentylenetetrazol (noun)	pentamethylenetetrazol (noun)
a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark	a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark