The three-letter word for a work unit is "erg".
A three-letter word that means "exist" is almost always "are." See if it will work.
work
"BOSS"
The 3-letter Greek letters that start with a "p" are phi and psi. The 3-letter Greek letter that ends in a "u" is tau. Other 3-letter Greek letters are eta, rho and chi. You work it out.
The three-letter word for something you use for walking is "leg." The human leg is a complex anatomical structure consisting of bones, muscles, tendons, and ligaments that work together to facilitate bipedal locomotion. Without functional legs, walking, running, and other forms of ambulation would be impossible for humans.
erg
A three-letter word that means "exist" is almost always "are." See if it will work.
A three-letter word for 'lucrative' is 'pay', as in, 'Does his work pay well? which could also be expressed as, 'Is his work lucrative?'
There are 9 * 8 * 7, or 504, three letter permutations that can be made from the letters in the work CLIPBOARD.
erg
Word.
Joule is a good one it is a measurment of energy
A sweet potato is also known as a yam.
An eight-letter word cannot be made from four letters. T, I, E and S are not sufficient to make an eight-letter word without knowing what letters can be repeated and how often they are repeated. TESTIEST could work if you allow three Ts.
Work Is a 4-Letter Word - 1968 is rated/received certificates of: Sweden:Btl
work
Work