Everything is classified into one of a bunch of classifiers, where a bunch might be a few dozen? Maybe hundreds, I'm not sure.
Some really common ones:
Rational beings like people, God, angles, etc. = "gha" (but not spirits, demons, ghosts, etc.; they are animals)
Flat things like the earth, plates, leaves, fields, the sky, etc. = "bae" (but modern Karens sometimes use "round" for the earth and moon instead)
Round things like balls, houses, rocks, a person or animals head, eyes, etc. = "pler"
Long skinny things like a stick, snake, road, etc = "bo"
Most kinds of animals = "doo" (but fish and birds are flat, and insects are round)
These words show up all over the place in basic grammar. Like "5 cows" would be "cows 5 doo". Sometimes they stand in for the actual name of what you're talking about, for example you might say "this cow" as "ta doo ee" and drop the word for cow entirely.