micrometeorite vs micrometeoroid

micrometeorite and micrometeoroid both are nouns.

Word	Noun	Adjective	Verb	Adverb
micrometeorite	Yes	No	No	No
micrometeoroid	Yes	No	No	No

As nouns, micrometeorite and micrometeoroid are synonyms defined as:

micrometeorite and micrometeoroid: a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere

Other synonyms of micrometeorite include micrometeor.

micrometeorite (noun)	micrometeoroid (noun)
a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere	a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere