purplish-red vs purplish red

purplish-red and purplish red both are nouns.

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

As nouns, purplish-red and purplish red are synonyms defined as:

purplish-red (noun)	purplish red (noun)
a red with a tinge of purple	a red with a tinge of purple

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