acetylene vs ethyne

acetylene and ethyne both are nouns.

Word	Noun	Adjective	Verb	Adverb
acetylene	Yes	No	No	No
ethyne	Yes	No	No	No

As nouns, acetylene and ethyne are synonyms defined as:

acetylene and ethyne: a colorless flammable gas used chiefly in welding and in organic synthesis

Other synonyms of acetylene include alkyne.

acetylene (noun)	ethyne (noun)
a colorless flammable gas used chiefly in welding and in organic synthesis	a colorless flammable gas used chiefly in welding and in organic synthesis