red-lavender vs reddish-lavender

red-lavender and reddish-lavender both are adjectives.

Word	Noun	Adjective	Verb	Adverb
red-lavender	No	Yes	No	No
reddish-lavender	No	Yes	No	No

As adjectives, red-lavender and reddish-lavender are synonyms defined as:

red-lavender and reddish-lavender: of something having a lavender color tinged with red

red-lavender (adjective)	reddish-lavender (adjective)
of something having a lavender color tinged with red	of something having a lavender color tinged with red