“IGUANIAN” is a valid word.

iguanalarge herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America
anginaany disease of the throat or fauces marked by spasmodic attacks of intense suffocative pain
guanin

annaa former copper coin of Pakistan and India
gaina quantity that is added
nana
guanany of several large turkey-like game birds of the family Cracidae; native to jungles of tropical America; resembling the curassows and valued as food
naanleavened bread baked in a clay oven in India; usually shaped like a teardrop
agin
anga
gaun
inia
unaia sloth of Central America that has two long claws on each forefoot and three long claws on each hindfoot

ainbelonging to or on behalf of a specified person (especially yourself); preceded by a possessive
guna weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
inna hotel providing overnight lodging for travelers
anamother of the ancient Irish gods; sometimes identified with Danu
ginstrong liquor flavored with juniper berries
nuna woman religious
nanyour grandmother
nagsomeone (especially a woman) who annoys people by constantly finding fault
ganseparate the seeds from (cotton) with a cotton gin
aniblack tropical American cuckoo
agatitle for a civil or military leader (especially in Turkey)
gnularge African antelope having a head with horns like an ox and a long tufted tail

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
aaa dry form of lava resembling clinkers
nuthe 13th letter of the Greek alphabet
aga soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography

IGUANIAN