Vocabulary consisting only from characters you are able to read
観察
かんさつ
observation, surveysuru
説く
とく
to explain, to advocate, to preach, to persuadegodan, verb
調整
ちょうせい
regulation, coordination, adjustment, tuning, modification, alterationsuru
種類
しゅるい
(1)variety, kind, type, category, (ctr) (2)counter for different sorts of things jlpt3, mix