grayish-blue vs greyish-blue

grayish-blue and greyish-blue both are adjectives.

Word	Noun	Adjective	Verb	Adverb
grayish-blue	No	Yes	No	No
greyish-blue	No	Yes	No	No

As adjectives, grayish-blue and greyish-blue are synonyms defined as:

Other synonyms of grayish-blue include gray-blue, grey-blue.

grayish-blue (adjective)	greyish-blue (adjective)
of blue tinged with grey	of blue tinged with grey