Note: I do not know the definition of
"concentration(ofamountofsubstance)" within
the phrase "concentration (of amount of
substance)".  The following sound alike:
concentration, concentration mole to volume,
concentration rate, concentration mass to
mass, concentration volume to volume,
concentration mass to volume, concentration
volume to mole, Chinese yuan renminbi.  The
following partially match: conductance,
conductivity, conversion change rate,
compressibility, cooling duty, coulomb, coul,
cotton bale, cotton bale Egypt, corrosion
rate, coomb, cord, cord foot, COP, Colombian
peso, Colombia.