[Tlhingan-hol] Klingon Word of the Day: 'ISjaH

[De'vID]

> Klingon word: 'ISjaH
> Part of speech: noun
> Definition: calendar

I have in a note which says "penum. for {DIS} + {jar} or {DIS} +
{jaj}".  I think the first word is "penum.", but I can't think of a
linguistics term which begins with those letters, and it's possible I
copied that incorrectly from somewhere.

Is there a term for when two related words or terms are almost written
the same, except for the first and last letter?

--
De'vID