Call them homonyms, homophones, or what you will; the tutor introduces another pair.

My coverage of homonyms began with my post of August 21, 2013. Searching up homophone and/or homonym on this site reveals my love of them.

Playing the Parker Brothers game Boggle (our version is from 1977), homonyms often surface. Here is a recent pair:

peel: (noun) the skin of a fruit.

peal: (noun) sound audible over a long distance.  As the storm began, he heard a peal of thunder.

Often, with a pair of homonyms, one is very familiar, while the other is rarely used.

HTH:)

Source:

Collins Essential Canadian English Dictionary & Thesaurus. Glasgow: HarperCollins,
   2006.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.