It is best to make up words in Scrabble (and, naturally, their definitions). I think so.
This morning:
zev: the number 10 in Hebrew
Selzfa: Zeus' wife's nickname
veawe: a polite address to a Spanish-speaking grandmother, when asking her to do something
Jtmuri: an ancient Central Asian tribe (the "j" is pronounced like a "y")
wewu: the name of a skin disease in Mayan (accent on the second syllable)
firny: the quality of a spot in a fossil where it is soft or goes to powder