Nouns

(n)alum1, ammonia alum, ammonium aluma white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
(n)alum1, potassium alum, potash aluma white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
(n)alum1a double sulphate of aluminum and potassium that is used as an astringent (among other things)
(n)alumnus, alumna, alum2, graduate, grada person who has received a degree from a school (high school or college or university)