love-in-idleness vs pink of my John

love-in-idleness and pink of my John both are nouns.

Word	Noun	Adjective	Verb	Adverb
love-in-idleness	Yes	No	No	No
pink of my John	Yes	No	No	No

As nouns, love-in-idleness and pink of my John are synonyms defined as:

love-in-idleness and pink of my John: a common and long cultivated European herb from which most common garden pansies are derived

Other synonyms of love-in-idleness include heartsease, Johnny-jump-up, Viola tricolor, wild pansy.

love-in-idleness (noun)	pink of my John (noun)
a common and long cultivated European herb from which most common garden pansies are derived	a common and long cultivated European herb from which most common garden pansies are derived