dapple vs nebula

dapple and nebula both are nouns.

Word	Noun	Adjective	Verb	Adverb
dapple	Yes	No	Yes	No
nebula	Yes	No	No	No

As nouns, nebula is a hyponym of dapple; that is, nebula is a word with a more specific, narrower meaning than dapple:

dapple (noun)	nebula (noun)
a small contrasting part of something	(pathology) a faint cloudy spot on the cornea
	an immense cloud of gas (mainly hydrogen) and dust in interstellar space
	cloudiness of the urine
	a medicinal liquid preparation intended for use in an atomizer

dapple (verb)	nebula (verb)
colour with streaks or blotches of different shades