moat
The word that is a homophone for both "speck" and "moat" is "mote."
mote, moat
mote, moat
stationary, stationery
The homophone for "small particle" is "molecule".
A homophone for a speck is "spec". A homophone for "trench around a castle" could be "moat".
I believe the word you are looking for his homophone.
Yes, "mote" in Mote Marine Laboratory stands for "marine." The word "mote" comes from the start of the term "marine research laboratory."
Lauren Mote is 5' 3".
Phillip Mote is 6' 3".
Edward Mote was born in 1797.
Edward Mote died in 1874.