“CINQUAIN” is a valid word. — 19 points Scrabble

niacina B vitamin essential for the normal function of the nervous system and the gastrointestinal tract
quinic
quinin
uncini

acinione of the small drupes making up an aggregate or multiple fruit like a blackberry
uncia

cain(Old Testament) Cain and Abel were the first children of Adam and Eve born after the Fall of Man; Cain killed Abel out of jealousy and was exiled by God
quai
quinone of five children born at the same time from the same pregnancy
inia
unaia sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot
unci(biology) any hook-shaped process or part

canairtight sealed metal container for food or drink or paint etc.
ainbelonging to or on behalf of a specified person (especially yourself); preceded by a possessive
inna hotel providing overnight lodging for travelers
nuna woman religious
nanyour grandmother
aniblack tropical American cuckoo
qua

ina unit of length equal to one twelfth of a foot
anan associate degree in nursing
naa silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)
unan organization of independent states formed in 1945 to promote international peace and security
aian agency of the United States Army responsible for providing timely and relevant and accurate and synchronized intelligence to tactical and operational and strategic level commanders
qi
nuthe 13th letter of the Greek alphabet

CINQUAIN