speck vs flyspeck

speck and flyspeck both are nouns.

Word	Noun	Adjective	Verb	Adverb
speck	Yes	No	Yes	No
flyspeck	Yes	Yes	No	No

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

Other hyponyms of speck include grain, grinding, chylomicron, identification particle.

speck (noun)	flyspeck (noun)
a very small spot	a tiny dark speck made by the excrement of a fly
a slight but appreciable amount
(nontechnical usage) a tiny piece of anything

speck (adjective)	flyspeck (adjective)
	very small

speck (verb)	flyspeck (verb)
produce specks in or on