magenta vs purplish-red

magenta and purplish-red both are nouns.

Word	Noun	Adjective	Verb	Adverb
magenta	Yes	Yes	No	No
purplish-red	Yes	Yes	No	No

As nouns, purplish-red is a hypernym of magenta; that is, purplish-red is a word with a broader meaning than magenta:

magenta: a primary subtractive color for light; a dark purple-red color; the dye for magenta was discovered in 1859, the year of the battle of Magenta
purplish-red: a red with a tinge of purple

Other hypernyms of magenta include purplish red.

magenta (noun)	purplish-red (noun)
a primary subtractive color for light; a dark purple-red color; the dye for magenta was discovered in 1859, the year of the battle of Magenta	a red with a tinge of purple

magenta (adjective)	purplish-red (adjective)
of deep purplish red	of red tinged with purple