blotch vs mottle

blotch and mottle both are nouns.

Word	Noun	Adjective	Verb	Adverb
blotch	Yes	No	Yes	No
mottle	Yes	No	Yes	No

As verbs, blotch and mottle are synonyms defined as:

blotch and mottle: mark with spots or blotches of different color or shades of color as if stained

Other synonyms of blotch include streak.

blotch (noun)	mottle (noun)
an irregularly shaped spot	an irregular arrangement of patches of color

blotch (verb)	mottle (verb)
mark with spots or blotches of different color or shades of color as if stained	colour with streaks or blotches of different shades
	mark with spots or blotches of different color or shades of color as if stained