particle vs flyspeck

particle and flyspeck both are nouns.

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

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

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

particle (noun)	flyspeck (noun)
a function word that can be used in English to form phrasal verbs	a tiny dark speck made by the excrement of a fly
a body having finite mass and internal structure but negligible dimensions
(nontechnical usage) a tiny piece of anything

particle (adjective)	flyspeck (adjective)
	very small