関与: take part in / 干与: be concerned with

巻頭: opening page of book; beginning of an essay; prefatory / 敢闘: fighting bravely / 完投: going the whole distance; pitching a whole game / 官等: official rank / 竿頭: top of a pole

関東: Kanto / 間島

孵卵器: incubator

場札: (cards) the discard pile in various kinds of card games; (cards) cards on the board (during a card game)

(programming) bar (metasyntactic variable)

a female given name / a unisex given name

(archaic) Short for と言う (to iu):

(non-productive) verb-forming suffix attached to nouns (generally for native Japanese words)

花札: Japanese playing cards, flower cards