garlic mustard vs jack-by-the-hedge

garlic mustard and jack-by-the-hedge both are nouns.

Word	Noun	Adjective	Verb	Adverb
garlic mustard	Yes	No	No	No
jack-by-the-hedge	Yes	No	No	No

As nouns, garlic mustard and jack-by-the-hedge are synonyms defined as:

garlic mustard and jack-by-the-hedge: European herb that smells like garlic

Other synonyms of garlic mustard include Alliaria officinalis, hedge garlic, sauce-alone.

garlic mustard (noun)	jack-by-the-hedge (noun)
European herb that smells like garlic	European herb that smells like garlic