mottle vs blotch

mottle and blotch both are nouns.

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

As verbs, mottle and blotch are synonyms defined as:

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

Other synonyms of mottle include streak.

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

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