cupoc : cup
The Illunse word for cup is cupoc.
This word is a mixture of the Old English word for cup which is cuppe (cup, a small drinking vessel) and the Latin word for cup which is poculum (drinking cup, bowl, drinking vessel; drink / draught).
This is the current word for cup.
Here's a link to Cup, in J.R.R. Tolkien's words.
cupocan : cups
The Illunse word for cups (nominative plural) is cupocan.
Cups in Latin is pocula. Cups in Old English is cuppan.