flostan : flowers
The Illunse word for flowers is flostan.
Flowers in Latin is floris. Flowers in Old English is blóstman.
In Old English, the word for flower, blóstma, is what is called a weak masculine noun. That's getting into grammar. Weak nouns form nominative plurals with -an endings. I'm going to include this type of plural ending in Illunse.
By the way, I couldn't find Quenya or Sindarin words for milk.