The term 'dust particle' refers to a very small particle of matter, usually composed of tiny particles of dirt, pollen, or other materials. The two crossword solutions for this term are 'MOTE' (4 letters) and 'SPECK' (5 letters). Both words refer to a very small particle, with 'MOTE' being the smaller of the two. A MOTE is typically defined as a particle of dust, while a SPECK is a slightly larger particle, often referring to a particle of dust or dirt.