fa person > fama people
machu chicken > machusha chickens
mysu cat > mysuna catz
uryg pig > urygkha pigs
barkhu dog > barkhuna or barkhunga dogs
chyn star > chynnya stars
To express a great number of something, reduplicate the main part of the word (i.e. everything but the plural suffix).
fafama lots of people
machumachusha lots of chickens
mysumysuna lots of cats
urygurygkha lots of pigs
barkhubarkhuna or barkhubarkhunga lots of dogs
chynchynnya lots of stars
This pattern can be extended with an additional reduplication to express an exceptionally large number of things, as in mysumysumysuna (lots and lots of cats), and another reduplication for an even greater amount, as in mysumysumysumysuna (lots and lots and lots of cats), and on into infinity, if you're so inclined.
When tense marking an intensified plural, it is acceptable to either mark every repetition of the word, or only the last one, before the suffix.
mysiumysiuna or mysumysiuna lots of cats (past)