knotted marjoram vs sweet marjoram

knotted marjoram and sweet marjoram both are nouns.

Word	Noun	Adjective	Verb	Adverb
knotted marjoram	Yes	No	No	No
sweet marjoram	Yes	No	No	No

As nouns, knotted marjoram and sweet marjoram are synonyms defined as:

knotted marjoram and sweet marjoram: aromatic European plant native to Mediterranean and Turkey; not widespread in Europe

Other synonyms of knotted marjoram include Majorana hortensis, Origanum majorana.

knotted marjoram (noun)	sweet marjoram (noun)
aromatic European plant native to Mediterranean and Turkey; not widespread in Europe	aromatic European plant native to Mediterranean and Turkey; not widespread in Europe