There are several Latin two lettered words which can be used alone or can be added to other words. The word "ut" which means how or sometimes means but is one example. The word "ab" connotes motion away from a fixed point and the word "ad" connotes motion toward a point. Sometimes the ab/ad's are added to a word as a prefix. The word 'tu' means you.
Human lol
"I" is a word.
The 4 lettered word for a water bird is Duck. xxx hope that helps
Women
vacuum
use
bay
Grub.
Rug?
Nee
hour
adit