Vocabulary consisting only from characters you are able to read
思いつく
omoicuku
to think of, to hit upon, to come into one's mind, to be struck with an ideagodan, jlpt3, verb
万
man
(num) 10,000, ten thousand, (adv) myriads, alljlpt5
大の字に
dainodžini
sprawled, spread-eagled, in the shape of the "dai" kanjimix
学会
gakkai
scientific society/academic meeting/academic conference/(P)gakkou
口語
kougo
(1)spoken language, (2)literary style based on (modern) spoken language bunpou