13 letter words:
nonadditivity21,
10 letter words:
additivity18,
divination14,
invitation13,
9 letter words:
vitiation12,
8 letter words:
divinity15,
nativity14,
addition10,
nidation9,
7 letter words:
avidity14,
tantivy13,
dittany11,
inanity10,
6 letter words:
vanity12,
oddity11,
avidin10,
dainty10,
tannoy9,
anoint6,
nation6,
titian6,
5 letter words:
dandy10,
noddy10,
toddy10,
avoid9,
davit9,
ditty9,
divan9,
divot9,
dotty9,
toady9,
today9,
viand9,
annoy8,
anyon8,
atony8,
avion8,
natty8,
nitty8,
tinny8,
vitta8,
iodid7,
danio6,
datto6,
ditto6,
donna6,
idiot6,
iodin6,
nitid6,
oidia6,
tondi6,
anion5,
inion5,
niton5,
taint5,
tanto5,
titan5,
4 letter words:
davy11,
navy10,
tivy10,
viny10,
didy9,
dyad9,
avid8,
diva8,
doty8,
tidy8,
tody8,
void8,
yond8,
ayin7,
nova7,
tiny7,
tony7,
tyin7,
vain7,
vina7,
vino7,
vita7,
yoni7,
dado6,
dido6,
adit5,
dato5,
dino5,
dint5,
dita5,
doat5,
doit5,
dona5,
nidi5,
nodi5,
toad5,
anon4,
anti4,
inia4,
inti4,
into4,
iota4,
naoi4,
nona4,
nota4,
tain4,
tint4,
titi4,
toit4,
3 letter words:
ivy9,
day7,
vid7,
yid7,
yod7,
any6,
avo6,
nay6,
ova6,
tav6,
toy6,
van6,
vat6,
via6,
yin6,
yon6,
add5,
dad5,
did5,
odd5,
ado4,
aid4,
and4,
dan4,
din4,
dit4,
don4,
dot4,
nod4,
oda4,
tad4,
tod4,
ain3,
ait3,
ani3,
ant3,
att3,
inn3,
ion3,
nan3,
nit3,
not3,
oat3,
tan3,
tao3,
tat3,
tin3,
tit3,
ton3,
tot3,
2 letter words:
ay5,
oy5,
ya5,
yo5,
ad3,
do3,
id3,
od3,
ai2,
an2,
at2,
in2,
it2,
na2,
no2,
oi2,
on2,
ta2,
ti2,
to2,