bluish-purple vs blue-purple

bluish-purple and blue-purple both are adjectives.

Word	Noun	Adjective	Verb	Adverb
bluish-purple	No	Yes	No	No
blue-purple	No	Yes	No	No

As adjectives, bluish-purple and blue-purple are synonyms defined as:

bluish-purple (adjective)	blue-purple (adjective)
of purple tinged with blue	of purple tinged with blue