speckle vs stipple

speckle is a noun but stipple is not a noun.

Word	Noun	Adjective	Verb	Adverb
speckle	Yes	No	Yes	No
stipple	No	No	Yes	No

As verbs, speckle and stipple are synonyms defined as:

speckle (noun)	stipple (noun)
a small contrasting part of something

speckle (verb)	stipple (verb)
mark with small spots	produce a mottled effect
produce a mottled effect	engrave by means of dots and flicks
	make by small short touches that together produce an even or softly graded shadow, as in paint or ink
	apply (paint) in small dots or strokes