lemon mint vs eau de cologne mint

lemon mint and eau de cologne mint both are nouns.

Word	Noun	Adjective	Verb	Adverb
lemon mint	Yes	No	No	No
eau de cologne mint	Yes	No	No	No

As nouns, lemon mint and eau de cologne mint are synonyms defined as:

lemon mint and eau de cologne mint: mint with leaves having perfume like that of the bergamot orange

Other synonyms of lemon mint include bergamot mint, Mentha citrata.

lemon mint (noun)	eau de cologne mint (noun)
mint with leaves having perfume like that of the bergamot orange	mint with leaves having perfume like that of the bergamot orange
an annual horsemint of central and western United States and northern Mexico