Vocabulary consisting only from characters you are able to read
楽観的
rakkanteki
optimistic, hopefulemo
最適
saiteki
optimum, the most suitablemix
口承文学
koushoubungaku
oral literature, oral traditionmix
体制
taisei
order, system, structure, set-up, organization, organisationmix
常微分方程式
joubibunhouteishiki
ordinary differential equationmath
鉱石
kouseki
ore, mineral, crystalmix
器官
kikan
organ (of body), instrumentmix
団体
dantai
organization, organisation, associationjlpt3
構成
kousei
organization, organisation, configuration, compositionsuru
主催
shusai
organization, organisation, sponsorshipsuru
原点
genten
origin (coordinates), starting pointmix
起源
kigen
origin, beginning, risemix
由来
yurai
origin, source, history, derivation, reason, destinyall
原意
gen'i
original meaningmix
原状
genjou
original statemix
目新しい
meatarashii
original, novel, newadj
独自
dokuji
original, peculiar, characteristic, proprietarymix
元来
ganrai
originally, primarily, essentially, logically, naturallymix
元祖
ganso
originator, founder, pioneer, inventormix
装飾品
soushokuhin
ornament, decorationmix
孤児
koji
orphan; orphanmix
大阪府
oosakafu
Osaka (metropolitan area)namae
振動
shindou
oscillation, vibrationsuru
他
hoka
other (esp. places and things)/the restadj, leda1
外
hoka
other place, the restjlpt5
他府県
tafuken
other prefecturesmix
余人
yojin
others, other people; others, other peoplemix
乙姫
otohime
Otohime, daughter of Ryuujinkami
故障中
koshouchuu
out-of-ordermix
場違い
bachigai
out-of-place, inappropriate, sticking out like a sore thumbmix
州外
shuugai
out-of-statemix
宿
yado
outcasts (those from Kamakura period to the Edo period, common around the Kyoto region); inn, lodgingmix
屋外
okugai
outdoors, alfrescomix
外出
gaishutsu; sotode
outing, trip, going out; (n,vs) outing, trip, going outsuru
域外
ikigai
outside the areamix
向こう
mukou
over there, opposite direction, across the wayjlpt3, jlpt5
優勝
yuushou
overall victory, championshipsuru
飲み過ぎ
nomisugi
overdrinking, excessive drinkingmix
重なり
kasanari
overlapping, piling, stackingmix
馬鹿丁寧
bakateinei
overly polite, excessively polite, polite to a faultmix
持ち主
mochinushi
owner, proprietormix
太平洋
taiheiyou
Pacific Oceanmix
缶詰
kandume
packing (in cans), canning, canned goods, tin canmix
荷作り
nidukuri
packing, baling, cratingsuru
田んぼ
tanbo
paddy field, farmmix
全頁
zenketsu
page total, total number of pagesmix
苦しみ
kurushimi
pain, anguish, distress, suffering, hardshipmix
一対
ittsui
pair (of screens or vases, etc.)mix
恐慌
kyoukou
panic, scare, consternationsuru
提灯
chouchin
paper lantern, Chinese lantern, Japanese lanternmix
紙幣
shihei
paper money, notes, billsmix
逆説的
gyakusetsuteki
paradoxicalmix
比類
hirui
parallel, equal, matchmix