sleigh/slay -- Is there a term for such a pair?

[Steve Boatti]

Whatever the correct term is, the general public, I believe, uses "homonym"
for words that sound alike but are spelled differently. See, for instance,
this website which catalogs "triple homonyms":

http://www.people.fas.harvard.edu/%7Endauber/triplehom/

In my Catholic grammar school in the 1950s, I was taught these were called
homonyms.

Steve Boatti