Vocabulary consisting only from characters you are able to read
戦う
tatakau
to fight/to battle/to combat/to struggle against/to wage war/to engage in contest/(P)godan, sensou, verb, vintrans
観察
kansacu
observation, surveysuru
験する
kensuru
to attempt, to test, to try outsuru
類
tagui
(1)kind, sort, type, (2)equal, match, peer; kind, sort, class, family, genus mix
親しい
šitašii
intimate, close (e.g. friend)jlpt3